"Well-ordered self-love is right and natural."

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

"That the saints may enjoy their beatitude and the grace of God more abundantly they are permitted to see the punishment of the damned in hell."

"The truth of our faith becomes a matter of ridicule among the infidels if any Catholic, not gifted with the necessary scientific learning, presents as dogma what scientific scrutiny shows to be false."

"We can't have full knowledge all at once. We must start by believing; then afterwards we may be led on to master the evidence for ourselves."

"Good can exist without evil, whereas evil cannot exist without good."

"In order for a war to be just, three things are necessary. First, the authority of the sovereign. Secondly, a just cause. Thirdly, a rightful intention."

"The highest manifestation of life consists in this: that a being governs its own actions. A thing which is always subject to the direction of another is somewhat of a dead thing."

"Moral science is better occupied when treating of friendship than of justice."

"If forgers and malefactors are put to death by the secular power, there is much more reason for excommunicating and even putting to death one convicted of heresy."

"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."

"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."

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

"Man cannot live without joy; therefore when he is deprived of true spiritual joys it is necessary that he become addicted to carnal pleasures."

"Whatever is received is received according to the nature of the recipient."

"By nature all men are equal in liberty, but not in other endowments."

"Faith has to do with things that are not seen and hope with things that are not at hand."

"The test of the artist does not lie in the will with which he goes to work, but in the excellence of the work he produces."

"Because philosophy arises from awe, a philosopher is bound in his way to be a lover of myths and poetic fables. Poets and philosophers are alike in being big with wonder."

"There is but one Church in which men find salvation, just as outside the ark of Noah it was not possible for anyone to be saved."

"Human salvation demands the divine disclosure of truths surpassing reason."

"Most men seem to live according to sense rather than reason."

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

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

"It is clear that he does not pray, who, far from uplifting himself to God, requires that God shall lower Himself to him, and who resorts to prayer not to stir the man in us to will what God wills, but only to persuade God to will what the man in us wills."

"To one who has faith, no explanation is necessary. To one without faith, no explanation is possible."

"Three things are necessary for the salvation of man: to know what he ought to believe; to know what he ought to desire; and to know what he ought to do."

"Because of the diverse conditions of humans, it happens that some acts are virtuous to some people, as appropriate and suitable to them, while the same acts are immoral for others, as inappropriate to them."

"To live well is to work well, to show a good activity."

"The principal act of courage is to endure and withstand dangers doggedly rather than to attack them."

"If, then, you are looking for the way by which you should go, take Christ, because He Himself is the way."

"How can we live in harmony? First we need to know we are all madly in love with the same God."

"How is it they live in such harmony the billions of stars - when most men can barely go a minute without declaring war in their minds about someone they know."

"It is requisite for the relaxation of the mind that we make use, from time to time, of playful deeds and jokes."

"Sorrow can be alleviated by good sleep, a bath and a glass of wine."

"Perfection of moral virtue does not wholly take away the passions, but regulates them."

"Hold firmly that our faith is identical with that of the ancients. Deny this, and you dissolve the unity of the Church."

"All the efforts of the human mind cannot exhaust the essence of a single fly."

"Love takes up where knowledge leaves off."

"To bear with patience wrongs done to oneself is a mark of perfection, but to bear with patience wrongs done to someone else is a mark of imperfection and even of actual sin."

"The things that we love tell us what we are."

"Wonder is the desire for knowledge."

"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."

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

"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."

"It is possible to demonstrate God's existence, although not a priori, yet a posteriori from some work of His more surely known to us."

"Reason in man is rather like God in the world."

"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."

"Friendship is the source of the greatest pleasures, and without friends even the most agreeable pursuits become tedious."

"All that is true, by whomsoever it has been said has its origin in the Spirit."