The object of virtue is the difficult and the good.
 Thomas Aquinas, Summa Theologica (1274). copy citation

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Author Thomas Aquinas
Source Summa Theologica
Topic virtue good
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

“and since grace is the source of merit, our actions are more meritorious. Obj. 2: Further, struggle and difficulty are required for merit; for it is written (2 Tim. 2:5) : "He . . . is not crowned except he strive lawfully" and the Philosopher says (Ethic. ii, 3) : "The object of virtue is the difficult and the good." But there is more strife and difficulty now. Therefore there is greater efficacy for merit. Obj. 3: Further, the Master says (Sent. ii., D, xxiv) that "man would not have merited in resisting temptation;” source