Whereof one cannot speak, thereof one must be silent.

Think of the tools in a tool-box: there is a hammer, pliers, a saw, a screwdriver, a rule, a glue-pot, nails and screws.--The function of words are as diverse as the functions of these objects.

A new word is like a fresh seed sown on the ground of the discussion.

I sit astride life like a bad rider on a horse. I only owe it to the horse's good nature that I am not thrown off at this very moment.

When we think about the future of the world, we always have in mind its being where it would be if it continued to move as we see it moving now. We do not realize that it moves not in a straight line and that its direction changes constantly.

Only a man who lives not in time but in the present is happy.

The philosopher is not a citizen of any community of ideas, that is what makes him a philosopher.