“It is not unreasonable to assume that the works of God, their existence and preceding non-existence, are the result of His wisdom, but we are unable to understand many of the ways of His Wisdom in His works. On this principle the whole Law of Moses is based; it begins with this principle: "And God saw all that He had made, and behold, it was very good"”
Source: Guide for the Perplexed (c. 1190), Part III, Ch.25
Context: It is not unreasonable to assume that the works of God, their existence and preceding non-existence, are the result of His wisdom, but we are unable to understand many of the ways of His Wisdom in His works. On this principle the whole Law of Moses is based; it begins with this principle: "And God saw all that He had made, and behold, it was very good" (Gen. i. 31); and it ends with this principle: "The Rock, perfect is His work" (Deut. xxxii. 4). Note it.
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Maimónides 180
rabbi, physician, philosopher 1138–1204Related quotes

The Thirteenth Revelation, Chapter 35

On First Principles, Bk. 1, ch. 2; par. 11
On First Principles

Source: Unspoken Sermons: Series I, II, III
Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 421.

As quoted in Poland : The Knight Among Nations (1907) by Louis E. Van Norman, p. 290; also in The Language of God (2006) by Francis Collins, pp. 230-31

“Speaking as a devout atheist, thank God in his Almighty wisdom that he made us mortal.”
http://movies.nytimes.com/2010/02/11/movies/11radical.html
Other sourced statements

Source: The Sayings and Teachings of the Great Mystics of Islam (2002), p.112

“God in his wisdom made the fly
And then forgot to tell us why.”
"The Fly"
Good Intentions (1942)
Variant: God in his wisdom made me fly, and then forgot to tell me why.