Doing good per se is good, but to make it meaningful, you must have a higher purpose. When we treat our own family members kindly, it's only natural. When we do good to strangers, it only makes us feel good. The higher purpose I am talking about is to do good for the sole purpose of pleasing God, not ourselves. This is the way to be set free and to build up lasting treasures in heaven. What Jesus has done to us is most meaningful because he died for us willingly in complete obedience to the Father. No act can be meaningful should God be kept out of the picture.