John Gills Exposition of the Bible Commentary - Isaiah 40:4
Every valley shall be exalted, and every mountain and hill shall be made low ,.... Which is not to be understood literally, but, as Kimchi says, parabolically and mystically: the meaning is, that in consequence of John's ministry, and our Lord's coming, such who were depressed and bowed down with the guilt of sin, and were low and humble in their own eyes, should be raised up and comforted; and that such who were elated with themselves, and their own righteousness, should be humbled; their... read more
Matthew Henry's Complete Commentary - Isaiah 40:3-8
The time to favour Zion, yea, the set time, having come, the people of God must be prepared, by repentance and faith, for the favours designed them; and, in order to call them to both these, we have here the voice of one crying in the wilderness, which may be applied to those prophets who were with the captives in their wilderness-state, and who, when they saw the day of their deliverance dawn, called earnestly upon them to prepare for it, and assured them that all the difficulties which stood... read more