True friendship is self-love at secondhand

To be capable of steady friendship or lasting love, are the two greatest proofs, not only of goodness of heart, but of strength of mind

Even in the common affairs of life, in love, friendship, and marriage, how little security have we when we trust our happiness in the hands of others!

He will never have true friends who is afraid of making enemies.

Or have I passed my time in pouring words like water into empty sieves, rolling a stone up a hill and then down again, trying to prove an argument in the teeth of facts, and looking for causes in the dark, and not finding them?

The dupe of friendship, and the fool of love; have I not reason to hate and to despise myself? Indeed I do; and chiefly for not having hated and despised the world enough.