《宋书·志·卷三十一》
毒药虽然用，最终被戟伤。 
毒药虽行，戟还自伤。 
Although his poison was useful, he ended up being killed by a halberd.
<s>[INST] Kindly elucidate the central themes in this passage in English: 毒药虽行，戟还自伤。  [/INST] Although his poison was useful, he ended up being killed by a halberd.</s>
Kindly elucidate the central themes in this passage in English: 毒药虽行，戟还自伤。
user
Although his poison was useful, he ended up being killed by a halberd.
assistant