Goodness is the only investment that never fails. (Henry David Thoreau, 19th century American philosopher)
Goodness, like kindness and generosity, is a character trait. We’ve not usually thought of them as investments, but the idea is helpful. When we are growing in character development, it just makes a lot of sense to be aware of how we can influence others to practice the same kinds of good behavior. Think of the return on investment if we all shared those qualities.
I am fully convinced, my dear brothers and sisters, that you are full of goodness. You know these things so well you can teach each other all about them (Romans 15:14).