God - Unknowable

Blessed is the man that hath acknowledged his belief in God and in His signs, and recognized that "He shall not be asked of His doings." Such a recognition hath been made by God the ornament of every belief, and its very foundation. Upon it must depend the acceptance of every goodly deed.  Fasten your eyes upon it, that haply the whisperings of the rebellious may not cause you to slip.

Bahá’u’lláh, Gleanings from the Writings of Bahá’u’lláh, p. 86-87

All superior kingdoms are incomprehensible to the inferior; how therefore could it be possible that the creature, man, should understand the almighty Creator of all?  That which we imagine, is not the Reality of God; He, the Unknowable, the Unthinkable, is far beyond the highest conception of man.

‘Abdu’l-Bahá, Paris Talks, p. 24-25

He doeth as He doeth, and what recourse have we? He carrieth out His Will, He ordaineth what He pleaseth. Then better for thee to bow down thy head in submission, and put thy trust in the All-Merciful Lord.

‘Abdu’l-Bahá, Selections from the Writings of ‘Abdu’l-Bahá, p. 51