It is horrible to see everything that one detested in the past coming back wearing the colors of the future.

It is not easy to imagine how little interested a scientist usually is in the work of any other, with the possible exception of the teacher who backs him or the student who honors him.

Science has made us gods even before we are worthy of being men.

It takes a very deep-rooted opinion to survive unexpressed.

The biologist passes. The frog stays the same.

We are not naïve enough to ask for pure men; we ask merely for men whose impurity does not conflict with the obligations of their job.

Being right is less important to us than the freedom to be wrong.