Nothing is more destructive of individual character than for a man to lose all faith in his own abilities for the prosecution of his work.

The person who doubts there is an external world does not need proof: he needs a cure.

Nothing is more destructive of individual character than for a man to lose all faith in his own abilities for the prosecution of his work.

Upon the progress of knowledge the whole progress of the human race is immediately dependent: he who retards that, hinders this also.

He who is firm in will molds the world to himself.

What sort of philosophy one chooses depends, therefore, on what sort of man one is; for a philosophical system is not a dead piece of furniture that we can reject or accept as we wish; it is rather a thing animated by the soul of the person who holds it.

The schools must fashion the person, and fashion him in such a way that he simply cannot will otherwise than what you wish him to will.