But man has no power over external things, since he can work no change in their nature.
 Thomas Aquinas, Summa Theologica (1274). copy citation

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Author Thomas Aquinas
Source Summa Theologica
Topic change power
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

“Now whatever man possesses naturally, he can fittingly call his own. Therefore man does not naturally possess external things. Obj. 3: Further, according to Ambrose (De Trin. i [*De Fide, ad Gratianum, i, 1] ) "dominion denotes power." But man has no power over external things, since he can work no change in their nature. Therefore the possession of external things is not natural to man. On the contrary, It is written (Ps. 8:8) : "Thou hast subjected all things under his feet." I answer that, External things can be considered in two ways.” source