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

The time you feel lonely is the time you most need to be by yourself.

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

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

All men's misfortunes spring from their hatred of 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.

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

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.

All of our unhappiness comes from our inability to be alone.