Extracts from the Writings of Bahá’u’lláh
It is the bounden duty of parents to rear their children to be staunch in faith, the reason being that a child who removeth himself from the religion of God will not act in such a way as to win the good pleasure of his parents and his Lord. For every praiseworthy deed is born out of the light of religion, and lacking this supreme bestowal the child will not turn away from any evil, nor will he draw nigh unto any good.
And in another Tablet, these exalted words have been revealed: O Muḥammad! The Ancient of Days hath turned His countenance towards thee, making mention of thee, and exhorting the people of God to educate their children. Should a father neglect this most weighty commandment … he shall forfeit rights of fatherhood, and be accounted guilty before God. Well is it with him who imprinteth on his heart the admonitions of the Lord, and steadfastly cleaveth unto them. God, in truth, enjoineth on His servants what shall assist and profit them, and enable them to draw nigh unto Him. He is the Ordainer, the Everlasting.
(The Kitáb-i-Aqdas: The Most Holy Book, Questions and Answers, number 105) 
The fruits that best befit the tree of human life are trustworthiness and godliness, truthfulness and sincerity; but greater than all, after recognition of the unity of God, praised and glorified be He, is regard for the rights that are due to one’s parents. This teaching hath been mentioned in all the Books of God, and reaffirmed by the Most Exalted Pen. Consider that which the Merciful Lord hath revealed in the Qur’án, exalted are His words: “Worship ye God, join with Him no peer or likeness; and show forth kindliness and charity towards your parents…” Observe how loving-kindness to one’s parents hath been linked to recognition of the one true God! Happy they who are endued with true wisdom and understanding, who see and perceive, who read and understand, and who observe that which God hath revealed in the Holy Books of old, and in this incomparable and wondrous Tablet.
(The Kitáb-i-Aqdas: The Most Holy Book, Questions and Answers, number 106) 
The Pen of Glory counselleth everyone regarding the instruction and education of children. Behold that which the Will of God hath revealed upon Our arrival in the Prison City and recorded in the Most Holy Book.4 Unto every father hath been enjoined the instruction of his son and daughter in the art of reading and writing and in all that hath been laid down in the Holy Tablet. He that putteth away that which is commanded unto him, the Trustees are then to take from him that which is required for their instruction, if he be wealthy, and if not the matter devolveth upon the House of Justice.
(Tablets of Bahá’u’lláh Revealed after the Kitáb-i-Aqdas, page 128) 
That which is of paramount importance for the children, that which must precede all else, is to teach them the oneness of God and the laws of God. For lacking this, the fear of God cannot be inculcated, and lacking the fear of God an infinity of odious and abominable actions will spring up, and sentiments will be uttered that transgress all bounds….
The parents must exert every effort to rear their offspring to be religious, for should the children not attain this greatest of adornments, they will not obey their parents, which in a certain sense means that they will not obey God. Indeed, such children will show no consideration to anyone, and will do exactly as they please.
Say, O My people! Show honour to your parents and pay homage to them. This will cause blessings to descend upon you from the clouds of the bounty of your Lord, the Exalted, the Great.
One of the distinguishing characteristics of this most great Dispensation is that the kin of such as have recognized and embraced the truth of this Revelation and have, in the glory of His name, the Sovereign Lord, quaffed the choice, sealed wine from the chalice of the love of the one true God, will, upon their death, if they are outwardly non-believers, be graciously invested with divine forgiveness and partake of the ocean of His Mercy.
This bounty, however, will be vouchsafed only to such souls as have inflicted no harm upon Him Who is the Sovereign Truth nor upon His loved ones. Thus hath it been ordained by Him Who is the Lord of the Throne on High and the Ruler of this world and of the world to come.
Extracts from the Writings and Utterances of ‘Abdu’l-Bahá
O ye my two beloved children! The news of your union, as soon as it reached me, imparted infinite joy and gratitude. Praise be to God, those two faithful birds have sought shelter in one nest. I beseech God that He may enable them to raise an honoured family, for the importance of marriage lieth in the bringing up of a richly blessed family, so that with entire gladness they may, even as candles, illuminate the world. For the enlightenment of the world dependeth upon the existence of man. If man did not exist in this world, it would have been like a tree without fruit. My hope is that you both may become even as one tree, and may, through the outpourings of the cloud of loving-kindness, acquire freshness and charm, and may blossom and yield fruit, so that your line may eternally endure.
(Selections from the Writings of ‘Abdu’l-Bahá, paragraph 88.1) 
Were there no educator, all souls would remain savage, and were it not for the teacher, the children would be ignorant creatures.
It is for this reason that, in this new cycle, education and training are recorded in the Book of God as obligatory and not voluntary. That is, it is enjoined upon the father and mother, as a duty, to strive with all effort to train the daughter and the son, to nurse them from the breast of knowledge and to rear them in the bosom of sciences and arts. Should they neglect this matter, they shall be held responsible and worthy of reproach in the presence of the stern Lord.
(Selections from the Writings of ‘Abdu’l-Bahá, paragraphs 98.1 and 98.2) 
Ye should consider the question of goodly character as of the first importance. It is incumbent upon every father and mother to counsel their children over a long period, and guide them unto those things which lead to everlasting honour.
(Selections from the Writings of ‘Abdu’l-Bahá, paragraph 108.1) 
Let the mothers consider that whatever concerneth the education of children is of the first importance. Let them put forth every effort in this regard, for when the bough is green and tender it will grow in whatever way ye train it. Therefore is it incumbent upon the mothers to rear their little ones even as a gardener tendeth his young plants. Let them strive by day and by night to establish within their children faith and certitude, the fear of God, the love of the Beloved of the worlds, and all good qualities and traits. Whensoever a mother seeth that her child hath done well, let her praise and applaud him and cheer his heart; and if the slightest undesirable trait should manifest itself, let her counsel the child and punish him, and use means based on reason, even a slight verbal chastisement should this be necessary. It is not, however, permissible to strike a child, or vilify him, for the child’s character will be totally perverted if he be subjected to blows or verbal abuse.
(Selections from the Writings of ‘Abdu’l-Bahá, paragraph 95.2) 
While the children are yet in their infancy feed them from the breast of heavenly grace, foster them in the cradle of all excellence, rear them in the embrace of bounty. Give them the advantage of every useful kind of knowledge. Let them share in every new and rare and wondrous craft and art. Bring them up to work and strive, and accustom them to hardship. Teach them to dedicate their lives to matters of great import, and inspire them to undertake studies that will benefit mankind.
(Selections from the Writings of ‘Abdu’l-Bahá, paragraph 102.3) 
If thou wouldst show kindness and consideration to thy parents so that they may feel generally pleased, this would also please Me, for parents must be highly respected and it is essential that they should feel contented, provided they deter thee not from gaining access to the Threshold of the Almighty, nor keep thee back from walking in the way of the Kingdom. Indeed it behoveth them to encourage and spur thee on in this direction.
Also a father and mother endure the greatest troubles and hardships for their children; and often when the children have reached the age of maturity, the parents pass on to the other world. Rarely does it happen that a father and mother in this world see the reward of the care and trouble they have undergone for their children. Therefore, children, in return for this care and trouble, must show forth charity and beneficence, and must implore pardon and forgiveness for their parents. So you ought, in return for the love and kindness shown you by your father, to give to the poor for his sake, with greatest submission and humility implore pardon and remission of sins, and ask for the supreme mercy.
(Some Answered Questions (Wilmette: Bahá’í Publishing Trust, 1984), pages 231 and 232) 
Regarding thy question about consultation of a father with his son, or a son with his father, in matters of trade and commerce, consultation is one of the fundamental elements of the foundation of the Law of God. Such consultation is assuredly acceptable, whether between father and son, or with others. There is nothing better than this. Man must consult in all things for this will lead him to the depths of each problem and enable him to find the right solution.
O dear one of ‘Abdu’l-Bahá! Be the son of thy father and be the fruit of that tree. Be a son that hath been born of his soul and heart and not only of water and clay. A real son is such a one as hath branched from the spiritual part of man. I ask God that thou mayest be at all times confirmed and strengthened.
(Selections from the Writings of ‘Abdu’l-Bahá, paragraph 117.1) 
The father must always endeavour to educate his son and to acquaint him with the heavenly teachings. He must give him advice and exhort him at all times, teach him praiseworthy conduct and character, enable him to receive training at school and to be instructed in such arts and sciences as are deemed useful and necessary. In brief, let him instil into his mind the virtues and perfections of the world of humanity. Above all he should continually call to his mind the remembrance of God so that his throbbing veins and arteries may pulsate with the love of God.
The son, on the other hand, must show forth the utmost obedience towards his father, and should conduct himself as a humble and a lowly servant. Day and night he should seek diligently to ensure the comfort and welfare of his loving father and to secure his good pleasure. He must forgo his own rest and enjoyment and constantly strive to bring gladness to the hearts of his father and mother, that thereby he may attain the good pleasure of the Almighty and be graciously aided by the hosts of the unseen.
Among the safeguards of the Holy Faith is the training of children, and this is among the weightiest of principles in all the Divine Teachings. Thus from the very beginning mothers must rear their infants in the cradle of good morals—for it is the mothers who are the first educators—so that, when the child cometh to maturity, he will prove to be endowed with all the virtues and qualities that are worthy of praise.
And further, according to the Divine commandments, every child must learn reading and writing, and acquire such branches of knowledge as are useful and necessary, as well as learning an art or skill. The utmost care must be devoted to these matters; any neglect of them, any failure to act on them, is not permissible.
Observe how many penal institutions, houses of detention and places of torture are made ready to receive the sons of men, the purpose being to prevent them, by punitive measures, from committing terrible crimes—whereas this very torment and punishment only increaseth depravity, and by such means the desired aim cannot be properly achieved.
Therefore must the individual be trained from his infancy in such a way that he will never undertake to commit a crime, will, rather, direct all his energies to the acquisition of excellence, and will look upon the very commission of an evil deed as in itself the harshest of all punishments, considering the sinful act itself to be far more grievous than any prison sentence. For it is possible so to train the individual that, although crime may not be completely done away with, still it will become very rare.
The purport is this, that to train the character of humankind is one of the weightiest commandments of God, and the influence of such training is the same as that which the sun exerteth over tree and fruit. Children must be most carefully watched over, protected and trained; in such consisteth true parenthood and parental mercy.
Otherwise, the children will turn into weeds growing wild, and become the cursed, Infernal Tree,5 knowing not right from wrong, distinguishing not the highest of human qualities from all that is mean and vile; they will be brought up in vainglory, and will be hated of the Forgiving Lord.
Wherefore doth every child, new-risen in the garden of Heavenly love, require the utmost training and care.