Abbreviators do harm to knowledge and to love.

First study the science, and then practice the art which is born of that science.

You will never have a greater or lesser dominion than that over yourself...the height of a man's success is gauged by his self-mastery; the depth of his failure by his self-abandonment. ...And this law is the expression of eternal justice. He who cannot establish dominion over himself will have no dominion over others.

No human investigation can be called real science if it cannot be demonstrated mathematically.

Learning is the only thing the mind never exhausts, never fears, and never regrets.

How many emperors and how many princes have lived and died and no record of them remains, and they only sought to gain dominions and riches in order that their fame might be ever-lasting.

Inequality is the cause of all local movements.