I can show you that the art of calculation has to do with odd and even numbers in their numerical relations to themselves and to each other.

Haughtiness lives under the same roof with solitude.

Because it is correct to make a priority of young people, taking care that they turn out as well as possible.

Love is an intermediate state between possession and deprivation.

No law or ordinance is mightier than understanding.

Experience proves that anyone who has studied geometry is infinitely quicker to grasp difficult subjects than one who has not.

There is also a third kind of madness, which is possession by the Muses, enters into a delicate and virgin soul, and there inspiring frenzy, awakens lyric... But he, who, not being inspired and having no touch of madness in his soul, comes to the door and thinks he will get into the temple by the help of art - he, I say, and his poetry are not admitted; the sane man is nowhere at all when he enters into rivalry with the madman.