Premanand Maharaj Ji
How do I end hatred or ill-will towards someone in my mind?
See Bhagwan in them and bear it calmly
Hatred ends through bhagwat bhav, seeing the Lord present in that person, and calmly bearing their hostile behaviour. Nothing else can remove it, and bearing it brings progress in this life and beyond.
Hold a feeling of Bhagwan within yourself towards that person: the Lord is present in them too, and their hostile behaviour comes to us to wash away some sin of mine.