I don't feel frightened by not knowing things.

Of course, you only live one life, and you make all your mistakes, and learn what not to do, and that's the end of you.

I couldn't claim that I was smarter than sixty-five other guys--but the average of sixty-five other guys, certainly!

I think it's much more interesting to live not knowing than to have answers which might be wrong. I have approximate answers, and possible beliefs, and different degrees of uncertainty about different things, but I am not absolutely sure of anything. There are many things I don't know anything about, such as whether it means anything to ask "Why are we here?" I might think about it a little bit, and if I can't figure it out then I go on to something else. But I don't have to know an answer. I don't feel frightened by not knowing things, by being lost in the mysterious universe without having any purpose - which is the way it really is, as far as I can tell.

The basis of action on love, the brotherhood of all men, the value of the individual... the humility of the spirit.

You can’t say A is made of B or vice versa. All mass is interaction.

What is necessary for 'the very existence of science,' and what the characteristics of nature are, are not to be determined by pompous preconditions, they are determined always by the material with which we work, by nature herself. We look, and we see what we find, and we cannot say ahead of time successfully what it is going to look like. ... It is necessary for the very existence of science that minds exist which do not allow that nature must satisfy some preconceived conditions.