The practical intellect is a motive power, not as executing movement, but as directing towards it
 Thomas Aquinas, Summa Theologica (1274). copy citation

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Author Thomas Aquinas
Source Summa Theologica
Topic power intellect
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 this is what the Philosopher says (De Anima iii, 10) ; that "the speculative differs from the practical in its end." Whence each is named from its end: the one speculative, the other practical—i.e. operative. Reply Obj. 1: The practical intellect is a motive power, not as executing movement, but as directing towards it; and this belongs to it according to its mode of apprehension. Reply Obj. 2: Truth and good include one another; for truth is something good, otherwise it would not be desirable; and good is something true, otherwise it would not be intelligible.” source