Life is not a miracle. It is a natural phenomenon, and can be expected to appear whenever there is a planet whose conditions duplicate those of the earth.[Stating how planets supporting life cannot be rare.]

I looked for it [heavy hydrogen, deuterium] because I thought it should exist. I didn’t know it would have industrial applications or be the basic for the most powerful weapon ever known [the nuclear bomb]...

[My study of the universe] leaves little doubt that life has occurred on other planets. I doubt if the human race is the most intelligent form of life.

[Pure research] is worth every penny it costs.