“God exists since mathematics is consistent, and the Devil exists since we cannot prove it.”
As quoted in Mathematical Circles Adieu (Boston 1977) by H Eves
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André Weil 11
French mathematician 1906–1998Related quotes

“The true work of God is all good, since it is existence.”
Source: Guide for the Perplexed (c. 1190), Part III, Ch.10

Kurt Gödel (1958, CW II, p. 241) as cited in: Feferman, Solomon. " Lieber Herr Bernays!, Lieber Herr Gödel! Gödel on finitism, constructivity and Hilbert's program* http://math.stanford.edu/~feferman/papers/bernays.pdf." dialectica 62.2 (2008): 179-203.

Source: Blue Mars (1996), Chapter 12, “It Goes So Fast” (p. 621)
100 Years of Mathematics: a Personal Viewpoint (1981)

God doesn't believe in atheists (2002)
“A true friend is a gift from God. Since God doesn't exist, guess what? Neither do true friends.”
Source: You Are Worthless: Depressing Nuggets of Wisdom Sure to Ruin Your Day

“The truth is that even the devil himself believes in the existence of God.”