III. The feeble and faint-hearted encouraged, v. 3, 4. God's prophets and ministers are in a special manner charged, by virtue of their office, to strengthen the weak hands, to comfort those who could not yet recover the fright they had been put into by the Assyrian army with an assurance that God would now return in mercy to them. This is the design of the gospel, 1. To strengthen those that are weak and to confirm them—the weak hands, which are unable either to work or fight, and can hardly be lifted up in prayer, and the feeble knees, which are unable either to stand or walk and unfit for the race set before us. The gospel furnishes us with strengthening considerations, and shows us where strength is laid up for us. Among true Christians there are many that have weak hands and feeble knees, that are yet but babes in Christ; but it is our duty to strengthen our brethren (Luke xxii. 32), not only to bear with the weak, but to do what we can to confirm them, Rom. xv. 1; 1 Thess. v. 14. It is our duty also to strengthen ourselves, to lift up the hands which hang down (Heb. xii. 12), improving the strength God has given us, and exerting it. 2. To animate those that are timorous and discouraged: Say to those that are of a fearful heart, because of their own weakness and the strength of their enemies, that are hasty (so the word is), that are for betaking themselves to flight upon the first alarm, and giving up the cause, that say, in their haste, "We are cut off and undone" (Ps. xxxi. 22), there is enough in the gospel to silence these fears; it says to them, and let them say it to themselves and one to another, Be strong, fear not. Fear is weakening; the more we strive against it the stronger we are both for doing and suffering; and, for our encouragement to strive, he that says to us, Be strong has laid help for us upon one that is mighty.