A man will be imprisoned in a room with a door that's unlocked and opens inwards; as long as it does not occur to him to pull rather than push.

Man has to awaken to wonder - and so perhaps do peoples. Science is a way of sending him to sleep again.

Philosophy is like trying to open a safe with a combination lock: each little adjustment of the dials seems to achieve nothing, only when everything is in place does the door open.

If a lion could talk, we could not understand him.

A man's thinking goes on within his consciousness in a seclusion in comparison with which any physical seclusion is an exhibition to public view.

It is an hypothesis that the sun will rise tomorrow: and this means that we do not know whether it will rise.