"O Lord! Indeed, the inmost reality of all created things can never hope to fathom the secrets even of the world of existence."

  

"He is God.

Thou art He, O my God, Whose most beauteous names and most sublime likenesses are sanctified above the comprehension of such as pride themselves on their knowledge of the realities of things, inasmuch as the spiders of idle fancy can never weave the frail webs of their understanding upon the loftiest summits to which even the birds of human thought are powerless to ascend. How, then, can such as are endued with insight discern the mysteries of Thy Reality that is concealed from the world of being? O Lord! Indeed, the inmost reality of all created things can never hope to fathom the secrets even of the world of existence. How, then, O my God, can it apprehend the hidden Secret, the well-guarded Mystery, which is inscrutable to even the most luminous of realities in the realm of being within the invisible world?

O God, my God! The wings of human thought can never hope to ascend unto the Kingdom of Mysteries, and the minds of the righteous are sore perplexed in attempting to attain unto the gems that lie wrapt within the veils of concealment." ...

(Light of the World: Selected Tablets of ‘Abdu’l-Bahá, #72, part 1)
www.bahai.org/r/178401543