Premanand Maharaj Ji
Why must I let go of hatred for even one person if I want to grow spiritually?
Hatred of one person blocks Bhagwan
If you want to be free inside, you can have no ill-will towards anyone. Hatred of even one person must be removed before Bhagwan can be attained.
If, on the path to realising Bhagwan, you hold hatred and ill-will towards even one person, then until that hatred and ill-will is gone, realisation of Bhagwan will not happen.