For only love can conquer hate

from Marvin Gaye – What's Going On Lyrics on Rap Genius

Meaning

A lot of people agree with your view, but unfortunately the men in power disagree, and are of the opinion that only war ends dissent.

This could also be a reference to Martin Luther King Jr’s quote:

Darkness cannot drive out darkness:
Only light can do that.
Hate cannot drive out hate:
only love can do that.

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