Adam knew Eve his wife and she conceived. It is a pity that this is still the only knowledge of their wives at which some men seem to arrive.

We say that a girl with her doll anticipates the mother. It is more true, perhaps, that most mothers are still but children with playthings.

Reason teaches us that what is good is good for something, and that what is good for nothing is not good at all.

His mind is so open - so open that ideas simply pass through it.

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.

I can myself conceive of nothing else than the experienced.