If I can get some student interested in science, if I can show members of the general public what's going on up there in the space program, then my job's been done.

I have never found a companion that was so companionable as solitude. We are for the most part more lonely when we go abroad among men than when we stay in our chambers. A man thinking or working is always alone, let him be where he will.

The only real progress lies in learning to be wrong all alone.

If you are lonely when you're alone, you are in bad company.

All men's miseries derive from not being able to sit in a quiet room alone.