Jamieson, Fausset and Brown on Zechariah 1:17

17. yet--though heretofore lying in abject prostration.

My cities--not only Jerusalem, but the subordinate cities of Judah. God claims them all as peculiarly His, and therefore will restore them.

through prosperity ... spread abroad--or overflow; metaphor from an overflowing vessel or fountain (compare Pr 5:16) [Pembellus]. Abundance of fruits of the earth, corn and wine, and a large increase of citizens, are meant; also spiritual prosperity.

comfort Zion--(Is 40:1, 2; 51:3).

choose--(Zec 2:12; 3:2; Is 14:1). Here meaning, "show by acts of loving-kindness that He has chosen." His immutable choice from everlasting is the fountain whence flow all such particular acts of love.