Remover of Difficulty

Bid them recite: "Is there any Remover of difficulties save God? Say: Praised be God! He is God! All are His servants, and all abide by His bidding!" Tell them to repeat it five hundred times, nay, a thousand times, by day and by night, sleeping and waking, that haply the Countenance of Glory may be unveiled to their eyes, and tiers of light descend upon them.'

Shoghi Effendi citing Nabíl citing Bahá’u’lláh in God Passes By, p. 119