We are all sentenced to solitary confinement inside our own skins, for life.

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

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.

When so many are lonely as seem to be lonely, it would be inexcusably selfish to be lonely alone.

Living alone makes it harder to find someone to blame.

Absolutely lonely people have few personal interactions of any kind.

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

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.

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.