St Josemaria explains that when one of the baptized tries to be better, through the Communion of Saints he or she is doing good to the whole Church.
Let's help the Church, let's serve the Church, let's love everyone, and then things will go well. And how will things do well? How will we help the Church? By trying -- as we say every day -- to conquer ourselves, each of us. We feel something dragging us downwards, and we say, "No. Upwards!"
And if with God's grace we conquer, we are helping everyone else through the communion of saints, sending them arterial blood, oxygenated blood that's pure and clean.