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, RSV). “Faithful is He who calls you, and He also will act!” (1 Thessalonians 5:24, author’s translation).(John Piper - A Godward Life)