Evil

56. How do we collaborate with divine Providence?
307-308
323
While respecting our freedom, God asks us to cooperate with him and gives us the ability to do so through actions, prayers and sufferings, thus awakening in us the desire “to will and to work for his good pleasure” (Philippians 2:13).
57. If God is omnipotent and provident, why then does evil exist?
309-310
324, 400
To this question, as painful and mysterious as it is, only the whole of Christian faith can constitute a response. God is not in any way - directly or indirectly - the cause of evil. He illuminates the mystery of evil in his Son Jesus Christ who died and rose in order to vanquish that great moral evil, human sin, which is at the root of all other evils.
58. Why does God permit evil?
311-314
324 

Faith gives us the certainty that God would not permit evil if he did not cause a good to come from that very evil. This was realized in a wondrous way by God in the death and resurrection of Christ. In fact, from the greatest of all moral evils (the murder of his Son) he has brought forth the greatest of all goods (the glorification of Christ and our redemption).