2. They must take that occasion to tell their children of the drying up of the Red Sea forty years before: As the Lord your God did to the Red Sea. Note. (1.) It greatly magnifies later mercies to compare them with former mercies, for, by making the comparison, it appears that god is the same yesterday, to-day, and for ever. (2.) Later mercies should bring to remembrance former mercies, and revive our thankfulness for them.