God often falls short of a perfection which would make Him very imperfect: He is His own law.
 Montesquieu, Persian Letters (1721). copy citation

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Author Montesquieu
Source Persian Letters
Topic perfection God
Date 1721
Language English
Reference
Note Translated by John Davidson
Weblink https://en.wikisource.org/wiki/Persian_Letters

Context

“If, on that account, a man should think that she was both fair and dark, that her eyes were black and blue, and that she was, at one and the same time, sweet tempered and haughty, he would pass for a fool. God often falls short of a perfection which would make Him very imperfect: He is His own law. Thus, although God is all-powerful, He can neither break His promises, nor deceive men. Often too, His importance is not subjective, but objective; and that is the reason why He cannot change the nature of things.” source