As we passed under a streetlamp I noticed, beside my own bobbing shadow, another great, leaping grotesquerie that had an uncanny suggestion of the frog world about it . . . judging from the shadow, it was soaring higher and more gaily than myself. 'Very well,' you will say, 'Why didn’t you turn around. That would be the scientific thing to do.' But let me tell you it is not done ― not on an empty road at midnight.

I once saw, on a flower pot in my own living room, the efforts of a field mouse to build a remembered field. I have lived to see this episode repeated in a thousand guises, and since I have spent a large portion of my life in the shade of a nonexistent tree I think I am entitled to speak for the field mouse.

Certainly science has moved forward. But when science progresses, it often opens vaster mysteries to our gaze. Moreover, science frequently discovers that it must abandon or modify what it once believed. Sometimes it ends by accepting what it has previously scorned.

I no longer cared about survival...I merely loved.

Lights come and go in the night sky. Men, troubled at last by the things they build, may toss in their sleep and dream bad dreams, or lie awake while the meteors whisper greenly overhead. But nowhere in all space or on a thousand worlds will there be men to share our loneliness.

It is frequently the tragedy of the great artist, as it is of the great scientist, that he frightens the ordinary man.

The future is neither ahead nor behind, on one side or another. Nor is it dark or light. It is contained within ourselves; its evil and good are perpetually within us.