“limits which no human being can possibly transgress”

O Salman! All that the sages and mystics have said or written have never exceeded, nor can they ever hope to exceed, the limitations to which man's finite mind hath been strictly subjected. To whatever heights the mind of the most exalted of men may soar, however great the depths which the detached and understanding heart can penetrate, such mind and heart can never transcend that which is the creature of their own conceptions and the product of their own thoughts. The meditations of the profoundest thinker, the devotions of the holiest of saints, the highest expressions of praise from either human pen or tongue, are but a reflection of that which hath been created within themselves, through the revelation of the Lord, their God. Whoever pondereth this truth in his heart will readily admit that there are certain limits which no human being can possibly transgress. Every attempt which, from the beginning that hath no beginning, hath been made to visualize and know God is limited by the exigencies of His own creation - a creation which He, through the operation of His own Will and for the purposes of none other but His own Self, hath called into being. Immeasurably exalted is He above the strivings of human mind to grasp His Essence, or of human tongue to describe His mystery.... 

- Baha’u’llah  (‘Gleanings from the Writings of Bahá'u'lláh’; The Compilation of Compilations, vol. II, The Importance of Prayer, Meditation, and the Devotional Attitude)