Do there exist many worlds, or is there but a single world? This is one of the most noble and exalted questions in the study of Nature.

A time will come when men will stretch out their eyes. They should see planets like our Earth.

A man that is of Copernicus’ Opinion, that this Earth of ours is a Planet, carry’d round and enlightn’d by the Sun, like the rest of them, cannot but sometimes have a fancy … that...

[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.

Do not ever get agitated by provoking thoughts and actions. Always keep your calm. This will shame the alien.