John 16:20-21

I assure you and most solemnly say to you, that you will weep and grieve [in great mourning], but the world will rejoice. You will be sorrowful, but your sorrow will be turned into joy. A woman, when she is in labor, has pain because her time [to give birth] has come; but when she has given birth to the child, she no longer remembers the anguish because of her joy that a child has come into the world.