A scientist has to be neutral in his search for the truth, but he cannot be neutral as to the use of that truth when found. If you know more than other people, you have more responsibility, rather than less.

I should never have made a good scientist, but I should have made a perfectly adequate one.

This ability to incorporate the past gives the sharpest diagnostic tool, if one asks whether a body of knowledge is a science or not. Do present practitioners have to go back to an original work of the past? Or has it been incorporated? ... Science is cumulative, and embodies its past.

By the year 2070 we cannot say, or it would be imbecile to do so, that any man alive could understand Shakespearean experience better than Shakespeare, whereas any decent eighteen-year-old student of physics will know more physics than Newton.

I was moving among two groups... who had almost ceased to communicate at all, who in intellectual, moral, and psychological climate had so little in common that... one might have crossed the ocean.

The pursuit of happiness is a most ridiculous phrase: if you pursue happiness you'll never find it.

I was searching for something a little more than a dashing metaphor, a good deal less than a cultural map: and for those purposes the two cultures is about right.