Teachers are more than any other group the guardians of civilization.

Bad philosophers may have a certain influence; good philosophers, never.

Science, by itself, cannot supply us with an ethic. It can show us how to achieve a given end, and it may show us that some ends cannot be achieved.

I believe that when I die I shall rot, and nothing of my ego will survive.

We are condemned to kill time, thus we die bit by bit. - Octavio Paz The time you enjoy wasting is not wasted time.

Change is scientific; progress is ethical; change is indubitable, whereas progress is a matter of controversy.

In considering irregular appearances, there are certain very natural mistakes which must be avoided.