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.
Thomas Aquinas

Distinctions drawn by the mind are not necessarily equivalent to distinctions in reality.
Thomas Aquinas

Every judgement of conscience, be it right or wrong, be it about things evil in themselves or morally indifferent, is obligatory, in such wise that he who acts against his conscience always sins.
Thomas Aquinas

God should not be called an individual substance, since the principal of individuation is matter.
Thomas Aquinas

It is necessary to posit something which is necessary of itself, and has no cause of its necessity outside of itself but is the cause of necessity in other things. And all people call this thing God.
Thomas Aquinas

Law is nothing other than a certain ordinance of reason for the common good, promulgated by the person who has the care of the community.
Thomas Aquinas

Love is a binding force, by which another is joined to me and cherished by myself.
Thomas Aquinas

Love must precede hatred, and nothing is hated save through being contrary to a suitable thing which is loved. And hence it is that every hatred is caused by love.
Thomas Aquinas

The knowledge of God is the cause of things. For the knowledge of God is to all creatures what the knowledge of the artificer is to things made by his art.
Thomas Aquinas

The theologian considers sin mainly as an offence against God; the moral philosopher as contrary to reasonableness.
Thomas Aquinas