From John Piper
The steadfast love of the Lord never ceases; his mercies never come to an end; they are new every morning; great is your faithfulness. (Lamentations 3:22-23)
God’s mercies are new every morning because each day only has enough mercy in it for that day.
This is why we tend to despair when we think that we may have to bear tomorrow’s load on today’s resources. God wants us to know: We won’t. Today’s mercies are for today’s troubles. Tomorrow’s mercies are for tomorrow’s troubles.
Sometimes we wonder if we will have the mercy to stand in terrible testing. Yes, we will. Peter says, “If you are reviled for the name of Christ, you are blessed, because the Spirit of glory and of God rests upon you” (1 Peter 4:14). When the reviling comes the Spirit of glory comes. It happened for Stephen as he was being stoned. It will happen for you. When the Spirit and the glory are needed they will come.
The manna in the wilderness was given one day at a time. There was no storing up. That is the way we must depend on God’s mercy. You do not receive today the strength to bear tomorrow’s burdens. You are given mercies today for today’s troubles.
Tomorrow the mercies will be new. “God is faithful, by whom you were called into the fellowship of his Son, Jesus Christ our Lord” (1 Corinthians 1:9).