https://marco.org/2007/10/25/the-great-thing-about-charity-as-a-tool-is-you
The great thing about charity as a tool is you can’t overuse it or wear it out. The more you use it, the more good you do. It’s like a car that runs on trash and produces purified drinking water. Nobody’s going to criticize the length of your commute or begrudge your Sunday drives.