thorns: the worthless prickly growth that covers land people have stopped working, always named as half of Isaiah's phrase for briers and thorns
This word turns up seven times, all of them in Isaiah, and never once on its own. It is always yoked to a second thorn word (שָׁמִיר), which English Bibles usually render "briers," and the two together make a single stock phrase. The phrase, not the plant, is what carries the meaning. Nobody can say which species Isaiah had in view, and it probably does not matter: this is the wild, prickly stuff that comes up wherever the ground stops being cared for.
What the phrase always describes is a reversal. Land that people once worked has been handed back to the wild:
- a vineyard that will not be pruned or hoed again (Isaiah 5:6)
- fields where a thousand vines once stood, worth a thousand pieces of silver (Isaiah 7:23)
- hillsides once broken up with a hoe, now left to cattle and sheep (Isaiah 7:25)
From there Isaiah puts the same thorns to a second use. Dry scrub catches fast and burns hot, so it becomes his picture of how quickly a fire can strip the ground bare: wickedness runs through the land the way flame runs through brambles (Isaiah 9:18), the Holy One of Israel eats up Assyria's thorns and briers "in one day" (Isaiah 10:17), and God says that if there were thorns in his vineyard he would march straight through them and burn them (Isaiah 27:4).
Other Hebrew thorn words behave differently. The ordinary everyday word for a thorn (קוֹץ) can stand by itself anywhere in the Bible, while the thistle of the curse on the ground (דַּרְדַּר) shares this word's habit of traveling in a fixed pair. Isaiah's phrase is the sharper one, because it is always aimed at farmland that has gone back to waste.