“Recite ye the verses of God every morn and eventide.” (Bahá’u’lláh, ‘The Kitáb-i-Aqdas’)

May 1

And now, concerning His words: “And then shall appear the sign of the Son of man in heaven.” By these words it is meant that when the sun of the heavenly teachings hath been eclipsed, the stars of the divinely-established laws have fallen, and the moon of true knowledge—the educator of mankind—hath been obscured; when the standards of guidance and felicity have been reversed, and the morn of truth and righteousness hath sunk in night, then shall the sign of the Son of man appear in heaven. By “heaven” is meant the visible heaven, inasmuch as when the hour draweth nigh on which the Day-star of the heaven of justice shall be made manifest, and the Ark of divine guidance shall sail upon the sea of glory, a star will appear in the heaven, heralding unto its people the advent of that most great light. In like manner, in the invisible heaven a star shall be made manifest who, unto the peoples of the earth, shall act as a harbinger of the break of that true and exalted Morn. These twofold signs, in the visible and the invisible heaven, have announced the Revelation of each of the Prophets of God, as is commonly believed. 
(Baha'u'llah, The Kitab-i-Iqan)