This phrase is saying that the best part of a person’s life is the small, unimportant, and often forgotten things they do that are kind or loving. These acts could be small things like paying someone a compliment, holding a door open for someone, or doing a nice thing for a person without expecting anything in return. These acts may seem like small gestures, but they really make a difference in the lives of others and are a sign of a good person’s character.