Luke 3:5

Verse 5. Every valley, and so forth If these words, in one sense, were a prediction of the deliverance of the Israelites from their captivity, (Isaiah 40:3) and an admonition to level the roads for those that were to return, they also signified the redemption of mankind from the slavery of sin; and that all obstacles, which retarded this benefit, should be removed, and also that the proud should be depressed, and the humble receive graces. Witham.