Self-control is like a muscle. If you are called upon to exercise self-control often in the course of a day, you get tired and you don’t have enough strength to exercise as much self-control in the evening. But love is the opposite. The more you love, the more you can love. A person who has one child does not love that child less when the second and third child come along. A person who loves his town does not love his country less. Love expands with use.

Brooks, David (2015-04-14). The Road to Character (Kindle Locations 3388-3391). Random House Publishing Group. Kindle Edition.