There is a moment of conception and a moment of birth, but between them there is a long period of gestation.

If all insects disappeared, all life on earth would perish. If all humans disappeared, all life on earth would flourish.

When you inoculate children with a polio vaccine, you don't sleep well for two or three months.

When I worked on the polio vaccine, I had a theory. I guided each [experiment] by imagining myself in the phenomenon in which I was interested. The intuitive realm . . . the realm of the imagination guides my thinking.

There is a moment of conception and a moment of birth, but between them there is a long period of gestation.

I speak about universal evolution and teleological evolution, because I think the process of evolution reflects the wisdom of nature. I see the need for wisdom to become operative. We need to try to put all of these things together in what I call an evolutionary philosophy of our time.

Good parents give their children Roots and Wings. Roots to know where home is, wings to fly away and exercise what's been taught them.