April 28

Before all else they [Baha’is] must sanctify their hearts and purify their motives, otherwise all efforts in furthering any enterprise will be fruitless. They must eschew affectation and imitation, for every man of understanding will instantly detect their loathsome odour. They must not neglect the special times they should set aside for meditation, reflection and prayer, for without the blessings and confirmations of God, success, progress and development are difficult, nay impossible. 
(‘Abdu’l-Baha, quoted by the Universal House of Justice in a message dated 10 February 1980 addressed to the Iranian believers resident in other countries throughout the world)