See, those who wield the primordial forces of creation have a long-running grudge with physics.

Then Thalia Grace became their leader and started recruiting even more young women to their cause, which grated on Nico – as if Bianca's death could be forgotten. As if she could be replaced.

I do not forget any good deed done to me & I do not carry a grudge for a bad one.

Grudges are for those who insist that they are owed something; forgiveness, however, is for those who are substantial enough to move on.

Stay at peace with everyone you meet and hold no grudge with anyone for any reason.