Unhappiness makes people vulnerable, incessant suffering unjust. Just as in the relations between a creditor and a debtor there is always an element of the disagreeable that can never be overcome, for the very reason that the one is irrevocably committed to the role of giver and the other to that of receiver, so in a sick person a latent feeling of resentment at every obvious sign of consideration is always ready to burst forth.

Stefan Zweig (1881-1942) Austrian novelist, playwright, journalist, biographer

Beware of Pity (1939)