When the devil is called the god of this world, it is not because he made it, but because we serve him with our worldliness.

We should love others truly, for their own sakes rather than our own.

Clearly the person who accepts the Church as an infallible guide will believe whatever the Church teaches.

There would not be a perfect likeness of God in the universe if all things were of one grade of being.

Reasoning is compared to understanding as movement is to rest, or acquisition to possession.... Since movement always proceeds from something immovable, and ends in something at rest, hence it is that human reasoning, in the order of inquiry and discovery, proceeds from certain things absolutely understood--namely, the first principles; and, again, in the order of judgment, returns by analysis to first principles, in the light of which it examines what it has found. Now it is clear that rest and movement are not to be referred to different powers, but to one and the same.

God himself would not permit evil in this world if good did not come of it for the benefit and harmony of the universe.

Because we cannot know what God is, but only what He is not, we cannot consider how He is but only how He is not.