God has given people free will and shown people they should obey the Ten Commandments and follow Jesus' example. (It's up the humans to follow God's instruction)
God has a plan for lives people may not always understand, but Christians should trust and have faith in God's plan. (God will never give us more suffering than we can cope with.)
God wants people to follow Jesus' example and help sufferers. (God's reasoning is beyond human understanding)
For many Catholics, suffering is a way to bring them closer to understanding Jesus' suffering, and bring about a greater good.
Catholic's pray for and try to help sufferers
Evil and suffering = preparation for Heaven as it gives people a chance to become better and improve their souls, to be rewarded with Heaven.