It means a that only a life spent helping others is a life worth living, or a life helping others in need is a good life.
.
Catholic Answer Christianity boils down to living a life for others. Jesus told us that we have to see Him in every single person in front of us, and treat them as Himself. A priest told a friend of mine, in confession: Humility is not thinking less of oneself but it is thinking of oneself less. We can not be saved if we are not humble.