From the Baha’i Writings:
For the core of religious faith is that mystical feeling which unites man with God. This state of spiritual communion can be brought about and maintained by means of meditation and prayer. And this is the reason why Bahá’u’lláh has so much stressed the importance of worship. It is not sufficient for a believer merely to accept and observe the teachings. He should, in addition, cultivate the sense of spirituality which he can acquire chiefly be means of prayer.
(From a letter written on behalf of the Guardian, Lights of Guidance, p. 506)