If you pick up a starving dog and make him prosperous, he will not bite
you. This is the principal difference between a dog and a man.
- Pudd'nhead Wilson
...gratitude is a debt which usually goes on accumulating like blackmail;
the more you pay, the more is exacted. In time, you are made to realize
that the kindness done you is become a curse and you wish it had not happened.
- Mark Twain's Autobiography
I don't care much for gratitude of the noisy, boisterous kind. Why, when
some men discharge an obligation, you can hear the report for miles around.
- quoted in Best Stories of the World, T. L. Masson, 1913
...I was gratified to see that he was not a swine who trampled calmly
over pearls, mistaking them for pebbles.
- Letter to W. D. Howells, 8/22/1874
courtesy of Dave Thomson