Prayer, Meditation, and Action
Therefore strive that your actions day by day may be beautiful prayers. Turn towards God, and seek always to do that which is right and noble. Enrich the poor, raise the fallen, comfort the sorrowful, bring healing to the sick, reassure the fearful, rescue the oppressed, bring hope to the hopeless, shelter the destitute!
O maid-servant of God! Chant the Words of God and, pondering over their meaning, transform them into actions! I ask God to cause thee to attain a high station in the Kingdom of Life forever and ever.
(‘Abdu’l-Bahá, Tablets of Abdul-Baha Abbas, vol. 1 (Chicago: Bahá’í Publishing Society, 1909), p. 85) 
Prayer and meditation are very important factors in deepening the spiritual life of the individual, but with them must go also action and example, as these are the tangible results of the former. Both are essential.
(From a letter dated 15 May 1944 written on behalf of Shoghi Effendi to an individual believer) 
The Master said guidance was when the doors opened after we tried. We can pray, ask to do God’s will only, try hard, and then if we find our plan is not working out, assume it is not the right one, at least for the moment.
(From a letter dated 29 October 1952 written on behalf of Shoghi Effendi to an individual believer) 
When a person becomes a Bahá’í, actually what takes place is that the seed of the spirit starts to grow in the human soul. This seed must be watered by the outpourings of the Holy Spirit. These gifts of the spirit are received through prayer, meditation, study of the Holy Utterances and service to the Cause of God. The fact of the matter is that service in the Cause is like the plough which ploughs the physical soil when seeds are sown. It is necessary that the soil be ploughed up, so that it can be enriched, and thus cause a stronger growth of the seed. In exactly the same way the evolution of the spirit takes place through ploughing up the soil of the heart so that it is a constant reflection of the Holy Spirit. In this way the human spirit grows and develops by leaps and bounds.
(From a letter dated 6 October 1954 written on behalf of Shoghi Effendi to an individual believer) 
The friends … should turn to God for guidance in prayer and meditation, should study the Teachings of the Faith and then arise and act. Prayer and meditation, and study, without action, are of no value, and action must be reinforced by these other things, which strengthen the soul and nourish the mind.
(From a letter dated 30 May 1956 written on behalf of Shoghi Effendi to the Hands of the Cause in Asia) 
The beloved Guardian has stressed over and over again, that to effectively teach the Faith, the individual must study deeply the Divine Word, imbibe its life-giving waters, and feast upon its glorious teachings. He should then meditate on the import of the Word, and finding its spiritual depths, pray for guidance and assistance. But most important, after prayer is action. After one has prayed and meditated, he must arise, relying fully on the guidance and confirmation of Bahá’u’lláh, to teach His Faith. Perseverance in action is essential, just as wisdom and audacity are necessary for effective teaching. The individual must sacrifice all things to this great goal, and then the victories will be won.
(From a letter dated 30 May 1956 written on behalf of Shoghi Effendi to the Hands of the Cause in the United States) 
Teaching is the source of Divine Confirmation. It is not sufficient to pray diligently for guidance, but this prayer must be followed by meditation as to the best methods of action and then action itself. Even if the action should not immediately produce results, or perhaps not be entirely correct, that does not make so much difference, because prayers can only be answered through action and if someone’s action is wrong, God can use that method of showing the pathway which is right. Therefore you and the other members of the … Assembly must arise and diligently teach the Cause. You will find that you will be guided and confirmed in this work.
(From a letter dated 22 August 1957 written on behalf of Shoghi Effendi to an individual believer)