August 31

Do thou meditate on that which We have revealed unto thee, that thou mayest discover the purpose of God, thy Lord, and the Lord of all worlds. In these words the mysteries of Divine Wisdom have been treasured.... 
(Baha’u’llah, ‘Gleanings from the Writings of Bahá'u'lláh’; The Compilation of the Compilations, Vol. II, The Importance of Prayer, Meditation, and the Devotional Attitude)