When a person becomes a Baha’i, 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…. Naturally there will be periods of distress and difficulty, and even severe tests, but if that person turns firmly toward the divine Manifestation, studies carefully His spiritual teachings and receives the blessings of the Holy Spirit, he will find that in reality these tests and difficulties have been the gifts of God to enable him to grow and develop.
From a letter dated 6 October 1954 written on behalf of Shoghi Effendi to an individual believer