We never know what we are talking about.

If we wish our civilization to survive we must break with the habit of deference to great men.

If you can't say it simply and clearly, keep quiet, and keep working on it till you can.

[To] interpret Parmenides as a Kant before Kant ... this is exactly what we must do.

The best thing that can happen to a human being us to find a problem, to fall in love with that problem, and to live trying to solve that problem, unless another problem even more lovable appears.

Contrary to the outstanding work of art, outstanding theory is susceptible to improvements.

The quest for precision is analogous to the quest for certainty and both - precision and certainty are impossible to attain.