If it's true that our species is alone in the universe, then I'd have to say the universe aimed rather low and settled for very little.

You cannot be lonely if you like the person you're alone with.

As I get older I'm more and more comfortable being alone.

All of our unhappiness comes from our inability to be alone.

I don't want to be alone, I want to be left alone.

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

Living alone makes it harder to find someone to blame.

I don't want to be alone, I want to be left alone.

Unless we love and are loved, each of us is alone, each of us is deeply lonely.

All men's misfortunes spring from their hatred of being alone.