To suffer out of love is fundamental for humanity

To suffer with the other and for others; to suffer for the sake of truth and justice; to suffer out of love and in order to become a person who truly loves — these are fundamental elements of humanity, and to abandon them would destroy man himself.

Are we capable of this? Is the other important enough to warrant my becoming, on his account, a person who suffers? Does truth matter to me enough to make suffering worthwhile? Is the promise of love so great that it justifies the gift of myself? In the history of humanity, it was the Christian faith that had the particular merit of bringing forth within man a new and deeper capacity for these kinds of suffering that are decisive for his humanity. The Christian faith has shown us that truth, justice and love are not simply ideals, but enormously weighty realities. It has shown us that God —Truth and Love in person—desired to suffer for us and with us. Bernard of Clairvaux coined the marvellous expression: Impassibilis est Deus, sed non incompassibilis — God cannot suffer, but he can suffer with. Man is worth so much to God that he himself became man in order to suffer with man in an utterly real way.

Benedict XVI Spe Salvi (39).