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

When Fortune comes, seize her in front with a sure hand, because behind she is bald.

Obstacles cannot crush me. Every obstacle yields to stern resolve. He who is fixed to a star does not change his mind.

Learning acquired in youth arrests the evil of old age.

O neglectful Nature, wherefore art thou thus partial, becoming to some of thy children a tender and benignant mother, to others a most cruel and ruthless stepmother? I see thy children given into slavery to others without ever receiving any benefit, and in lieu of any reward for the services they have done for them they are repaid by the severest punishments.

Movement will fail sooner than usefulness.

Nothing strengthens authority so much as silence.