I answer that, Human virtue is a habit perfecting man in view of his doing good deeds.
 Thomas Aquinas, Summa Theologica (1274). copy citation

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Author Thomas Aquinas
Source Summa Theologica
Topic virtue habit
Date 1274
Language English
Reference
Note Translated by Fathers of the English Dominican Province
Weblink http://www.gutenberg.org/cache/epub/17897/pg17897-images.html

Context

“since they are not about the passions, which are the chief concern of moral virtue. Therefore virtue is not adequately divided into intellectual and moral. On the contrary, The Philosopher says (Ethic. ii, 1) that "virtue is twofold, intellectual and moral." I answer that, Human virtue is a habit perfecting man in view of his doing good deeds. Now, in man there are but two principles of human actions, viz. the intellect or reason and the appetite: for these are the two principles of movement in man as stated in De Anima iii, text. 48. Consequently every human virtue must needs be a perfection of one of these principles.” source