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

Always give a word or sign of salute when meeting or passing a friend, or even a stranger, if in a lonely place.

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

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

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.

I finally faced the fact that it isn't a crime not having friends. Being alone means you have fewer problems.

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

It is strange to be known so universally and yet to be so lonely.

Even in the presence of others he was completely alone.