September 1

Whoso hath searched the depths of the oceans that lie hid within these exalted words, and fathomed their import, can be said to have discovered a glimmer of the unspeakable glory with which this mighty, this sublime, and most holy Revelation hath been endowed.... 
(Baha’u’llah, ‘Gleanings from the Writings of Bahá'u'lláh, The Compilation of Compilations, vol. I, The Importance of Deepening our Knowledge of the Faith)