He is his own best friend and takes delight in privacy whereas the man of no virtue or ability is his own worst enemy and is afraid of solitude.

In educating the young we steer them by the rudders of pleasure and pain

Money was established for exchange, but interest causes it to be reproduced by itself. Therefore this way of earning money is greatly in conflict with the natural law.

Since music has so much to do with the molding of character, it is necessary that we teach it to our children.

It is the repeated performance of just and temperate actions that produces virtue.

The so-called Pythagoreans, who were the first to take up mathematics, not only advanced this subject, but saturated with it, they fancied that the principles of mathematics were the principles of all things.

There is a foolish corner in the brain of the wisest man.