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

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

Only the lonely know the way I feel tonight.

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

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

Even in the presence of others he was completely alone.

I restore myself when I'm 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.

I don't want to be alone, I want to be left alone.

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