A man tempts God, if having the means at hand, without reason he chooses a dangerous course, trying whether he can be delivered by God.
 Thomas Aquinas, Summa Theologica (1274). copy citation

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Author Thomas Aquinas
Source Summa Theologica
Topic God reason
Date 1274
Language English
Reference
Note Translated by Fathers of the English Dominican Province
Weblink http://www.gutenberg.org/cache/epub/18755/pg18755-images.html

Context

“"As we know not what to do, we can only turn our eyes to Thee." But if this be done without any useful or urgent motive, this is to tempt God implicitly. Wherefore a gloss on Deut. 6:16, "Thou shalt not tempt the Lord thy God," says: "A man tempts God, if having the means at hand, without reason he chooses a dangerous course, trying whether he can be delivered by God." Reply Obj. 1: Man also is sometimes tempted by means of deeds, to test his ability or knowledge or will to uphold or oppose those same deeds. Reply Obj. 2: When saints work miracles by their prayers, they are moved by a motive of necessity or usefulness to ask for that which is an effect of the divine power.” source