Even in the presence of others he was completely alone.

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

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

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.

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

I restore myself when I'm alone.

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

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

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

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