Adam Clarke on Jeremiah 32:39

I will give them one heart - And that a clean one.

And one way - And that a holy and safe one: and to have this clean heart, and to walk in this good way, will be for the good of them and their children after them. God's blessing is a profitable inheritance. They shall have but one object of worship, and one way of salvation; and being saved from sin, idolatry, and destruction, they must necessarily be happy within and happy without.