Moreover the light of the moon shall be as the light of the sun, and the light of the sun shall be sevenfold, as the light of seven days, in the day that the LORD bindeth up the breach of his people, and healeth the stroke of their wound.
The light of the moon ... the light of the sun - image from the heavenly bodies, to express the increase of spiritual light and felicity. "Seven-fold" implies the perjection of that felicity, seven being the sacred number. It shall also be literally fulfilled here after in the heavenly city (Isaiah 60:19-20; Revelation 21:23-24; Revelation 22:5).
The breach of his people - the wound or calamity sent by God on account of their sins (Isaiah 1:5).