II. God excites and encourages Jeremiah to apply himself with all diligence and seriousness to his business. A great trust is committed to him. He is sent in God's name as a herald at arms, to proclaim war against his rebellious subjects; for God is pleased to give warning of his judgments beforehand, that sinners may be awakened to meet him by repentance, and so turn away his wrath, and that, if they do not, they may be left inexcusable. With this trust Jeremiah has a charge given him (v. 17): "Thou, therefore, gird up thy loins; free thyself from all those things that would unfit thee for or hinder thee in this service; buckle to it with readiness and resolution, and be not entangled with doubts about it." He must be quick: Arise, and lose no time. He must be busy: Arise, and speak unto them in season, out of season. He must be bold: Be not dismayed at their faces, as before, v. 8. In a word, he must be faithful; it is required of ambassadors that they be so.