I paint self-portraits because I am so often alone, because I am the person I know best.

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.

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.

Alone we can do so little together we can do so much.

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

There are places and moments in which one is so completely alone that one sees the world entire.

Absolutely lonely people have few personal interactions of any kind.

Associate with men of good quality if you esteem your own reputation for it is better to be alone than in bad company.

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

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