Thomas Aquinas:

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

— Thomas Aquinas Medieval

Catholic philosopher and theologian

Summa Theologica, Part II-II, Q. 40, Art. 1

c. 1265-1274

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Cross Reference

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"The sin against nature is the most grievous of sins."

"The greatest evil is to do wrong and not to suffer for it."

"The proper object of the human intellect is the quiddity or essence of a material thing."

"The virtue of chastity is a part of temperance."

"Man is by nature a social animal."