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

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

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

Only the lonely know the way I feel tonight.

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.

I restore myself when I'm alone.

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

Even in the presence of others he was completely alone.

Yes, I guess you could say I am a loner, but I feel more lonely in a crowed room with boring people than I feel on my own.