Generosity, or dana, is one of the ten paramitas of Buddhism. This quote opens an article on it in this month's Tricycle:
When you are practicing generosity, you should feel a little pinch when you give something away. That pinch is your stinginess protesting. If you give away your old, worn-out coat that you wouldn't be caught dead wearing, that is not generosity. There is no pinch. [...] Giving away your coat might keep someone warm, but it does not address the problem we face as spiritual practitioners: to free ourselves from self-cherishing and self-grasping.
- Gelek Rimpoche