Abbreviators do harm to knowledge and to love.

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

The eye encompasses the beauty of the whole world.

To lie is vile, to tell truth is excellent, if not noble.

He who does not understand the supreme certainty of mathematics is wallowing in confusion.

If you are alone you belong entirely to yourself. If you are accompanied by even one companion you belong only half to yourself or even less in proportion to the thoughtlessness of his conduct and if you have more than one companion you will fall more deeply into the same plight.

The natural desire of good men is knowledge.