“It was necessary for our salvation that there be a knowledge revealed by God, besides philosophical science built up by human reason. Firstly, indeed, because the human being is directed to God, as to...”

Summa Theologica

“Whatever is in motion must be put in motion by another. If that by which it is put in motion be itself put in motion, then this also must needs be put in motion by another, and that by another again. ...”

Summa Theologica

“The fire of hell is called eternal, only because it never ends. Still, there is change in the pains of the lost...Hence in hell true eternity does not exist, but rather time.”

Summa Theologica

“Whether God can make the past not to have been?”

Summa Theologica

“Reason may be employed in two ways to establish a point: firstly, for the purpose of furnishing sufficient proof of some principle, as in natural science, where sufficient proof can be brought to show...”

Summa Theologica