The intellect is compared to the will as moving the will.
 Thomas Aquinas, Summa Theologica (1274). copy citation

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Author Thomas Aquinas
Source Summa Theologica
Topic 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

“Boulesis is distinct from thelesis on account of a distinction, not of powers, but of acts. Reply Obj. 2: Choice and will—that is, the act of willing—are different acts: yet they belong to the same power, as also to understand and to reason, as we have said. Reply Obj. 3: The intellect is compared to the will as moving the will. And therefore there is no need to distinguish in the will an active and a passive will. _______________________ QUESTION 84 HOW THE SOUL WHILE UNITED TO THE BODY UNDERSTANDS CORPOREAL THINGS BENEATH IT” source