Isaiah 19:22

‘And Yahweh will smite Egypt, smiting and healing, and they will return to Yahweh, and he will be entreated of them, and he will heal them.'

This summarises all that has gone before in the chapter. Yahweh will smite Egypt, but in the end it is that He might heal. This is at the root of all God's activity in the world. In microcosm it is the picture of world history. He has smitten that He might heal.