People tend naturally to assume that if God exists, then His purpose for human life is happiness in this life. God’s role is to provide a comfortable environment for His human pets. But on the Christian view, this is false. We are not God’s pets, and the goal of human life is not happiness per se, but the knowledge of God—which in the end will bring true and everlasting human fulfilment. Many evils occur in life which may be utterly pointless with respect to the goal of producing human happiness; but they may not be pointless with respect to producing a deeper knowledge of God. ― William Lane Craig (from, Hard Questions, Real Answers)