„If you do what you’ve always done, you’ll get what you’ve always gotten.”

True originality consists not in a new manner but in a new vision.

True friends are like stars;

Success does not consist in never making mistakes but in never making the same one a second time.

Conquer yourself and the whole universe is yours.

The powers of the mind are like the rays of the sun when they are concentrated they illumine.

Man's mind is so formed that it is far more susceptible to falsehood than to truth.