Maimonides (1135/8–1204), The Guide for the Perplexed, Ch. LIX:
… God cannot be the object of human comprehension, that none but Himself comprehends what He is, and that our knowledge consists in knowing that we are unable truly to comprehend Him. All philosophers say, “He has overpowered us by His grace, and is invisible to us through the intensity of His light,” like the sun which cannot be perceived by eyes which are too weak to bear its rays. Much more has been said on this topic, but it is useless to repeat it here. The idea is best expressed in the book of Psalms, “Silence is praise to Thee” (lxv. 2). It is a very expressive remark on this subject; for whatever we utter with the intention of extolling and of praising Him, contains something that cannot be applied to God, and includes derogatory expressions; it is therefore more becoming to be silent, and to be content with intellectual reflection, as has been recommended by men of the highest culture, in the words “Commune with your own heart upon your bed, and be still” (Ps. iv. 4).