Jeremiah 31:21

Set thee up waymarks, make thee high heaps: set thine heart toward the highway, even the way which thou wentest: turn again, O virgin of Israel, turn again to these thy cities.

Set thee up way-marks - pillars to mark the road for the returning exile. Caravans set up pillars, or pointed heaps of stones, to mark the way through the desert against their return. So Israel is told by God to mark the way by which they went in leaving their country for exile; for by the same way they shall return.

Set thine heart toward the highway - (; ).