Never run in the rain with your socks on.
Scientia is knowledge. It is only in the popular mind that it is equated with facts.
[Intellectual courage is] the quality that allows one to believe in one's judgement in the face of disappointment and widespread skepticism. Intellectual courage is even rarer than physical courage.
Our assessment of socio-economic worth is largely a sham. We scientists should not lend ourselves to it - though we routinely do. We should, instead, insist on applying the criterion of quality.
Idealism is the highest form of reason.
In education the appetite does indeed grow with eating. I have never known anyone to abandon study because they knew too much.
Authority in science exists to be questioned, since heresy is the spring from which new ideas flow.
I go from English to Spanish, and I feel I have some cool songs.
The true epic of our times is not "Arm's and the Man," but "Tools and the Man"--an infinitely wider kind of epic.
I would not exchange the laughter of my heart for the fortunes of the multitudes; nor would I be content with converting my tears, invited by my agonized self, into calm. It is my fervent hope that my whole life on this earth will ever be tears and laughter. Tears that purify my heart and reveal to me the secret of life and its mystery, Laughter that brings me closer to my fellow men; Tears with which I join the broken-hearted, Laugher that symbolizes joy over my very existence.
The protection of our citizens, the spirit and honor of our country, require that force should be interposed to a certain degree.