The main thing in Catholicism is love for one's neighbour. "He who loves his neighbour fulfils his law." (St. Paul, Rom. XIII, 8). This love, to be t… - Camilo Torres Restrepo

Spartacus, for example, wanted to put an end to slavery and killing and had to do it fast lest he himself die in the gladiators’ ring. To succeed, he had to kill those bent on killing him. He hoped to eliminate political injustice completely and, to do so, felt he had to eliminate all the unjust. Robespierre hoped to eliminate political injustice completely and, to do so, felt he had to eliminate all the unjust. Lenin and Trotsky, bent on eradicating what they felt was the real cause of injustice—economic exploitation—thought themselves compelled to do away with all those strong enough to perpetuate it and, in so doing, set up the framework by which arbitrary elimination could be carried out by their successor, Stalin. Yet, for all their faults, who would say that the world is not better off today as a result? Only one who has never been a slave could condemn Spartacus. Only one who has never been politically irrelevant could condemn Robespierre. Only one who has never been hungry could condemn Lenin.

The catholic who is not a revolutionary is living in mortal sin.

The Church's temporary defects should not scandalize us. The Church is human. What is important is to believe that she is also divine and that if we Christians fulfill our obligation to love our neighbor, we are strengthening the Church.