as the hot thing which can communicate heat is more perfect that what is unable to give heat.
 Thomas Aquinas, Summa Theologica (1274). copy citation

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Author Thomas Aquinas
Source Summa Theologica
Topic heat
Date 1274
Language English
Reference
Note Translated by Fathers of the English Dominican Province
Weblink http://www.gutenberg.org/cache/epub/17611/pg17611-images.html

Context

“All things are possessed in common by the angelic society, some things, however, being held more excellently by some than by others. Each gift is more perfectly possessed by the one who can communicate it, than by the one who cannot communicate it; as the hot thing which can communicate heat is more perfect that what is unable to give heat. And the more perfectly anyone can communicate a gift, the higher grade he occupies, as he is in the more perfect grade of mastership who can teach a higher science. By this similitude we can reckon the diversity of grades or orders among the angels, according to their different offices and actions.” source