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

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

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

Only the lonely know the way I feel tonight.

I finally faced the fact that it isn't a crime not having friends. Being alone means you have fewer problems.

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

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

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

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