Hatred, rancor and grudge, they are not humanity elements; but you need to have them to survive.

Revenge is only sweet to those whom rancor have distorted their taste.

The dragon spits fire, what extinguishes its tears. When we live in rancor, we are born to be old. (Le dragon crache du feu, - Ce qui éteint ses larmes. - Quand on vit de rancune, - On naît pour être vieux.).