Set thee up waymarks. The "virgin of Israel" is addressed. She is directed to mark out the road for the returning exiles. The command is obviously the. torical in form; the general sense is that the Israelites are to call to mind the road so familiar to their forefathers, though only known to themselves by tradition.
The word rendered "waymarks" occurs again in 2 Kings 33:17 and Ezekiel 39:15. It apparently means a stone pillar, which might be used either as a waymark or a sepulchral monument. The high heaps seem to mean much the same thing; "signposts" would be a better rendering.
Set thine heart toward the highway; rather, turn thy thoughts, etc; for the heart is here evidently the symbol of the intellectual rather than the moral life. A passage in the Psalms (Psalms 84:6) will occur to every one, in which a psalmist, longing at a distance for the services of the temple, pronounces blessed the man "in whose heart are the highways [to Zion];" here, it is true, "heart" has the double meaning of "mind" and "affections," but "highway" has almost exactly the same sense as in the passage before us.
To these thy cities. The unseen speaker is supposed to be in Palestine.