Thomas Aquinas

The intellect is the highest power of the soul.

The female is a misbegotten male.

It is right that Jews, in consequence of their sins, be or remain in perpetual slavery; and so the princes may treat the goods of the Jews as their own, with the sole proviso that they do not deprive them of what is necessary to sustain life.

The possession of a concubine is not unlawful, if due regard be had to the conditions which make it lawful.

As regards the last point, whether a woman is bound to obey her husband, it must be said that a woman is bound to obey her husband in those things which pertain to the ordering of the household, and to the upbringing of children, and to the management of family affairs.

Woman is in some respects defective and misbegotten, for the active force in the male seed tends to the production of a perfect likeness in the masculine sex; while the production of a woman comes from a defect in the active force, or from some material indisposition, or even from some external change, such as that of the south wind, which is moist, as the Philosopher observes.

It is clear that the male is more noble than the female. For the male is the principle of generation, and the female is the matter.

The natural order among men is that women should be subject to men.

The killing of an innocent person is a greater sin than the killing of a guilty person.

It is lawful to kill a man in self-defense, provided that one uses no more violence than is necessary.

Heretics, therefore, must be excommunicated and cut off from the Church, and, finally, delivered to the secular tribunal to be put to death.

If a man be a fornicator, or an adulterer, or a drunkard, or any such like, he is not thereby cut off from the Church, because such sins do not separate a man from the faith. But heresy does separate a man from the faith, and consequently from the Church.

The Church has the power to excommunicate, and to deliver to the secular arm.

It is lawful to wage war, provided it be for a just cause, and by the authority of the sovereign.

It is lawful to kill an enemy in a just war.

Slavery is a natural institution, because some men are by nature slaves, and others are by nature masters.

A slave is an instrument of his master, and is his property.

It is lawful for a master to beat his slave, provided he does not kill him or maim him.

The children of slaves are slaves by birth.

If a man commits the sin of sodomy, he is to be put to death.