For this is he] The words of the Evangelist, giving a reason, why John preached thus. The voice of one crying] Isaiah 40:3. Mark 1:3. He spake thus loud and fervently, concerning Christ, because it was his office. Prepare ye the way of the Lord] As men make the wayes plain and smooth, and take all rubs out of the way, when an harbinger gives them warning of the coming of the king: so do ye spiritually prepare your hearts to entertain Christ, who is now at hand.