live by the sword, die by the sword

saying3

1. •
   One who uses violence can expect a violent response; it is better to try to use peaceful means wherever possible.
2. •
   (figurative) One can expect dire outcomes from any vice; used to convey a sense that poetic justice is inevitable.
3. •
   (figurative) The means of one's success can become the means of one's downfall.

   • And in Dirk Diggler's most anguished scene, as he shouts at Jack Horner, "I'm ready to shoot my scene RIGHT NOW!" we learn that those who live by the sword can also die by it. — 1997