Then shall thy light break forth as the morning, and thine health shall spring forth speedily: and thy Then shall thy light break forth as the morning, and thine health shall spring forth speedily: and thy righteousness shall go before thee; the glory of the LORD shall be thy rereward.
Then shall thy light break forth as the morning - "light," emblem of prosperity (Isaiah 58:10; Job 11:17).
And thine health - literally, a long bandage ( 'aruwkaah (H724), from 'aarak (H748), to make long), applied by surgeons to heal a wound (cf. Isaiah 1:6). Hence, restoration from all past calamities.
And thy righteousness shall go before thee. Thy conformity to the divine covenant acts as a leader, conducting thee to peace and prosperity. Not as the ground of justification, but as its inseparable accompaniment (cf. Revelation 14:13).
The glory of the Lord shall be thy rereward - like the pillar of cloud and fire, the symbol of God's "glory," which went behind Israel, separating them from their Egyptian pursuers (Isaiah 52:12; Exodus 14:19-20).