“If you think of this world as a place intended simply for our happiness, you find it quite intolerable: think of it as a place of training and correction and it’s not so bad” — C. S. Lewis [1]

I would also add that it’s a place of rehabilitation and preparation for the life to come.

[1] C. S. Lewis, “Answers to Questions on Christianity,” essay, in God in the Dock: Essays on Theology and Ethics, ed. Walter Hooper (Grand Rapids, MI: Eerdmans, 1970), 52.