But hope is the disposition of an imperfect thing, of one, namely, that lacks what it hopes to have. Therefore hope is not a virtue.
 Thomas Aquinas, Summa Theologica (1274). copy citation

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Author Thomas Aquinas
Source Summa Theologica
Topic virtue hope
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

“But hope is caused by grace and merits, according to the Master (Sent. iii, D, 26) . Therefore hope is not a virtue.
Obj. 3: Further, "virtue is the disposition of a perfect thing" (Phys. vii, text. 17, 18). But hope is the disposition of an imperfect thing, of one, namely, that lacks what it hopes to have. Therefore hope is not a virtue. On the contrary, Gregory says (Moral. i, 33) that the three daughters of Job signify these three virtues, faith, hope and charity. Therefore hope is a virtue.
I answer that, According to the Philosopher (Ethic. ii, 6) "the virtue of a thing is that which makes its subject good, and its work good likewise." Consequently wherever we find a good human act, it must correspond to some human virtue.” source