Date: 1273

"Therefore the soul, which is the first principle of life, is not a body, but the act of a body; thus heat, which is the principle of calefaction, is not a body, but an act of a body."

— St. Thomas Aquinas (1225-1274)

Date: 1273

"Thirdly, because the action of a motor is never attributed to the thing moved, except as to an instrument; as the action of a carpenter to a saw. Therefore if understanding is attributed to Socrates, as the action of what moves him, it follows that it is attributed to him as to an instrument"

— St. Thomas Aquinas (1225-1274)

Date: 1273

"And (De Anima ii, 3) he [Aristotle] compares the various souls to the species of figures, one of which contains another; as a pentagon contains and exceeds a tetragon."

— St. Thomas Aquinas (1225-1274)

Date: 1273

"The artisan, for instance, for the form of the saw chooses iron adapted for cutting through hard material; but that the teeth of the saw may become blunt and rusted, follows by force of the matter itself. So the intellectual soul requires a body of equable complexion, which, however, is corrupti...

— St. Thomas Aquinas (1225-1274)

Date: 1273

"But the shape is united to the wax without a body intervening. Therefore also the soul is thus united to the body."

— St. Thomas Aquinas (1225-1274)

Date: 1273

"For eternity is compared to time as immovable to movable. And thus Boethius compared the intellect to eternity, and reason to time."

— St. Thomas Aquinas (1225-1274)

Date: 1273

"For "opinion" signifies an act of the intellect which leans to one side of a contradiction, whilst in fear of the other."

— St. Thomas Aquinas (1225-1274)

Date: 1273

"While to 'judge' or 'measure' [mensurare] is an act of the intellect, applying certain principles to examine propositions. From this is taken the word 'mens' [mind]."

— St. Thomas Aquinas (1225-1274)