A thousand tiny good works
If you subscribe to the idea that making tons of poor choices will lead to poor outcomes, I think it only makes sense that you should also believe that making tons of good choices will lead to good outcomes.
I’m not a religious person, but this is the closest thing to faith that I have. It’s playing the numbers, isn’t it? Doing an act of kindness, or acting for good, or choosing to speak truth in the face of inconvenience, are all ways to stack the probabilities so that it’s more likely that good things happen in the long run than bad.
People say “death by a thousand cuts” but I can’t think of an equivalent phrase for improving things by a thousand tiny acts of caring.
I think “building brick by brick” is the closest phrase I can think of, yet it’s not exactly what I want because it’s more like consistently following a construction plan. The expression I want should suggest that even random, unplanned kindness eventually create goodness.