Shared ground
These lines present God as the decisive power who stops hostile opponents of the king. The enemies are not merely defeated in the moment; their future capacity to threaten is pictured as ending. The text says their “seed/descendants” and “posterity” are removed “from the earth” and “from among humankind,” language that points to the end of an ongoing line and influence, not only a single setback.
The passage also links outcome to intent. The enemies “intended evil” and “plotted” against “you,” but the plan “cannot succeed.” The failure is not portrayed as accidental; it is the result of God’s opposition. The closing image is battlefield-like: the enemies retreat (“turn their back”) because God is pictured as an armed warrior aiming a drawn bow at them.
Where interpretation differs
Who is the “you”? Some read “you” as God alone: the enemies’ crime is directly opposing God, so their plans collapse. Others read “you” as God addressed in a way that includes God’s anointed king (God and king bound together in the psalm’s viewpoint), so opposition to the king counts as opposition to God’s rule.
How literal is the removal of descendants? Some take the language as describing literal death or extermination of a family line in war. Others understand it as poetic overstatement for a complete defeat: the enemy’s power, memory, and ability to re-form as an organized threat is erased (possibly through death, exile, or loss of standing).
Why the disagreement exists
The psalm uses compressed poetic language and speaks in images (“destroy…from the earth,” “aim drawn bows”). That leaves more than one plausible way to map the imagery onto events (death vs. exile vs. erased legacy), and royal psalms often speak of God and the king in closely connected terms, making “you” slightly ambiguous.
What this passage clearly contributes
Explicitly, it claims: (1) God will remove the enemies’ descendants and posterity; (2) the enemies planned evil against “you”; (3) their plot will not succeed; (4) God will drive them into retreat; (5) God’s armed threat (bow imagery) is what routs them. Theological inference that fits the text is that opposition to God’s chosen rule is ultimately self-defeating: real schemes are made, but they meet a limit set by God’s power and purpose (cf. Psalm 21:8 for the broader section’s theme of God “finding out” enemies).