Mercy in Judgment.
I. GOD'S PURPOSE IN DEALING WITH THE WICKED BY CHASTISEMENT AND NOT BY JUDGMENT (13-16). God might have desolated the land, and let Israel pass unquestioned through the midst of it. But in Pharaoh and his people the Lord would, by foretold, continued, deepening chastisements, reveal the terror and resistlessness of his power. He would make the heart of the oppressor quail in every age and nation, and stir up the oppressed to hope and prayer. But for this prolonged contest with Pharaoh we should have lacked much that has gone to deepen holy fear of God and trust in him.
II. HOW GOD LEADS UP THE WEAKEST FAITH INTO STRENGTH (20, 21).
1. Warning was given, and those who had merely faith enough to believe that God's word might be kept, had time to save their servants and their cattle.
2. In the after contrast between themselves and those who had despised the warning, faith would spring up into full assurance. The trust we give to God, like the seed we cast into the soil, is given back to us an hundredfold. How God answers the prayer, "Lord increase our faith."—U.