Date: 1273

"We may therefore say that the soul understands, as the eye sees; but it is more correct to say that man understands through the soul."

— St. Thomas Aquinas (1225-1274)

Date: 1273

"For that whereby primarily anything acts is a form of the thing to which the act is to be attributed: for instance, that whereby a body is primarily healed is health, and that whereby the soul knows primarily is knowledge; hence health is a form of the body, and knowledge is a form of the soul."

— St. Thomas Aquinas (1225-1274)

Date: 1273

"It is separate indeed according to its intellectual power, because the intellectual power does not belong to a corporeal organ, as the power of seeing is the act of the eye; for understanding is an act which cannot be performed by a corporeal organ, like the act of seeing."

— St. Thomas Aquinas (1225-1274)

Date: 1273

"Further, the Philosopher says (De Anima. ii, 1) that the relation of a part of the soul to a part of the body, such as the sight to the pupil of the eye, is the same as the relation of the soul to the whole body of an animal."

— St. Thomas Aquinas (1225-1274)