A happy life must be to a great extent a quiet life, for it is only in an atmosphere of quiet that true joy dare live.
Liberty is the right to do what I like; license, the right to do what you like.
A superstition which pretends to be scientific creates a much greater confusion of thought than one which contents itself with simple popular practices.
There is something feeble and a little contemptible about a man who cannot face the perils of life without the help of comfortable myths.
I do not pretend to start with precise questions. I do not think you can start with anything precise. You have to achieve such precision as you can, as you go along.
The only thing that will redeem mankind is cooperation.
Whether the aim is in heaven or on earth, wisdom or wealth, the essential condition of its pursuit and attainment is always security and order.
I like mathematics because it is not human and has nothing particular to do with this planet or with the whole accidental universe – because, like Spinoza’s God, it won’t love us in return.
Men who are unhappy, like men who sleep badly, are always proud of the fact.
The demand for certainty is one which is natural to man, but is nevertheless an intellectual vice.