His mind is so open - so open that ideas simply pass through it.
The man who has ceased to fear has ceased to care.
The secret of happiness is to admire without desiring. And that is not happiness.
It is good to know what a man is, and also what the world takes him for. But you do not understand him until you have learnt how he understands himself.
Metaphysics is the finding of bad reasons for what we believe on instinct.
The hunter for aphorisms on human nature has to fish in muddy water, and he is even condemned to find much of his own mind.