Musar על אבות 2:16

Thus we learn from here that we are obligated in this matter, and cannot exempt ourselves due to our lack of power. For on all such matters, we learned: "It is not incumbent upon you to complete the task, but neither are you free to abstain from it" (Avot 2:16).

Pele Yoetz – on Sinah - Hatred - Hatred [of others] is hated [by Hash-m] for upon it the Tanna said Rabbi Yehoshua says a bad eye & the evil inclination & hatred of the creatures [of Hash-m], expel a person from the world. (Pirkei Avot 2:11 on Self-Destruction And it causes many sins for hatred awakens quarrels & one falls into the grips of controversy & evil speech & causes one to become happy for the misfortune [of others] & to damage & cause pain & to take vengeance & to spite like a snake [against the other] & many similar evils. And it is written in the holy books – that there is no sin of all the sins like hatred – because every moment one transgresses upon that that is written in the Torah “Do not hate your brother in your heart.” and that that is written “You shall love your fellow as yourself.” & this is the reason why gratuitous hatred destroyed the Holy Temple. And any kind of of hatred is considered 'gratuitous hatred', for any kind of claims that he has [against the other party] to express, are vanity, acts of delusion, like we explained above in the section of 'love of [our] fellows' - see there.