The first favor is a favor, the second an obligation.
More Chinese Proverbs:
Happiness is like a sunbeam, which the least shadow intercepts, while adversity is often as the rain in the spring.Chinese
With money one may command devils; without it, one cannot even summon a man.
Chinese
Honey in his mouth, knives in his heart.
Chinese
The emperor is rich, but he cannot buy one extra year.
Chinese
Better do it than wish it done.
Chinese
It is often more difficult to come back home than it is to go away.
Chinese