Beat your plowshares into swords, and your pruninghooks into spears: let the weak say, I am strong.
Beat your plowshares into swords. As the foes are desired to "beat their plowshares into swords, and their pruning-hooks into spears," that so they may perish in their unhallowed attack on Judah and Jerusalem; so these latter, and the nations converted to God by them, after the overthrow of the anti-Christian confederacy, shall, on the contrary, "beat their swords into plowshares, and their spears into pruning-hooks," when under Messiah's coming reign they "shall learn war no more" (Isaiah 2:4; Hosea 2:18; Micah 4:3).
Let the weak say, I am strong - so universal shall be the rage of Israel's foes for invading her, that even the weak among them will fancy themselves strung enough to join the invading forces. Age and infirmity were ordinarily made valid excuses for exemption from service; but so mad shall be the fury of the world against God's people, that even the feeble will not desire to be exempted (cf. Psalms 2:1-3).