Those that want friends are cannibals of their own hearts. Communicating a man's self to his friends redoubleth his joys and cutteth griefs in halves. A friend is another himself. If a man have not a friend, he may quit the world's stage!
Bacon
A favourite has no friend.
Gray
It is only the great-hearted who can be true friends; the mean and cowardly can never know what true friendship means.
Charles Kingsley
We walk alone in the world. Friends such as we desire are dreams and fables. But a sublime hope cheers ever the faithful heart, that elsewhere, in other regions of the universal power, souls are now acting, enduring, and daring, which can love us and which we can love.
Emerson