Take to thee yet the instrument - o
Of a foolish shepherd - Osorius: “Yet He had enacted one tragedy, in which he clearly set forth the future guilt of Judas; now another is set forth, the accumulated scoffing through antichrist. For as Paul said, because they receive not the Spirit of truth, the Allrighteous Judge shall send them a spirit of “delusion, that they should believe a lie” 2 Thessalonians 2:10-11. He calls him a foolish shepherd, for since the extremest folly consists in the extremest wickedness, he will be the most foolish, who reached the highest impiety, and this he will do by arrogating to himself divinity and claiming divine honors 2 Thessalonians 2:4.
This is the only action, which the prophet had to enact or to relate. If it was a visible act, the instrument might be a staff which should bruise, an instrument which should bear a semblance to that of the good shepherd, but which should be perncious. Cyril: “Good shepherds, who understood their business, had slight staves, that, if there should be occasion to strike, the stricken sheep might not be bruised; but one who understandeth not, beats them with thicker clubs.” Or it may mean also, whatever he would use for the hurtful treatment of the sheep, such as he proceeds to speak of. He is spoken of as, in fact, foolishly sinful: for sin is the only real folly, and all real folly has sin mingled in it. The short-lived wisdom of the foolish shepherd for his own ends should also be his destruction.