And shall say... — Better, And one said. The prophet hears, as it were, a voice behind him, bringing an oracle from Heaven, which renews the cry of the herald in Isaiah 40:3. The verb, cast up, points to the construction of the “highway” of a spiritual return, from which all impediments are removed.
Related Commentaries of Isaiah 57:14
Isaiah 57:14
14 And shall say, Cast ye up, cast ye up, prepare the way, take up the stumblingblock out of the way of my people.