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.

Every man must do two things alone he must do his own believing and his own dying.

The best part about being alone is that you really don't have to answer to anybody. You do what you want.

I never said, 'I want to be alone.' I only said, 'I want to be left alone.' There is all the difference.

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

Look at the sky. We are not alone. The whole universe is friendly to us and conspires only to give the best to those who dream and work.

I love to be alone. I never found the companion that was so companionable as solitude.

A man content to go to heaven alone will never go to heaven.

Love is our true destiny. We do not find the meaning of life by ourselves alone - we find it with another.

Every man must do two things alone he must do his own believing and his own dying.