I used the pencil to stab the student in front of me
I can't believe you did that! Did you seriously stab someone with a pencil?
I always wanted to attack him because he insulted me!
You shouldn't stab anyone just because they insulted you. They may require a trip to the hospital for their injury. You'll be suspended or expelled for attacking this student.
Nah, I think it's okay to hurt him.
It's not okay to hurt anyone over words. I hope you learn you lesson when you get kicked out of school.