Philosophy is the true mother of science.
The name of peace is sweet, and the thing itself is beneficial, but there is a great difference between peace and servitude. Peace is freedom in tranquillity, servitude is the worst of all evils, to be resisted not only by war, but even by death.
Old age is by nature rather talkative.
Those who do not know history will forever remain children
Do nothing twice over.
In a disordered mind, as in a disordered body, soundness of health is impossible.