““When we notice someone suffering and immediately decide to help them, it “says” to our associates, “See how easily I’m moved to help others? When people near me are suffering, I can’t help wanting to make their situation better; it’s just who I am.” This is a profoundly useful trait to advertise; it means you’ll make a great ally. The more time other people spend around you, the more they’ll get to partake of your spontaneous good will. It’s this function of charity that accounts for a lot of the puzzles we discussed earlier. For one, it explains why we donate so opportunistically. Most donors don’t sketch out a giving strategy and follow through as though it were a business plan.””