I hate this study, and I'm not going to forget it anytime soon.

You don't hold grudges because it's bad for your health.

I don't hold grudges because I'm too lazy.

We are not the mayonnaise.

Yes, but fixing that might lead me to the prison. I better be angry at my imbecilish neighbours than kill those pieces of shit but then spend 15 years in prison(where I would have most probably even worse neighbours).

… of my enemies.

Resentment is a poison pill you swallow, with the hope that it harms your enemy.

...but then what am I supposed to do with my "Book of Grudges"?

Grunge on the other hand is awesome!

isnt repressing anger/grudges just as bad? you need to have a way to solve your grudges.