THE CONCEPTION OF LOVE AND HATE
Master Jun Hong Lu: Any form of love or hatred in this mortal world is accumulated from countless lifetimes. If you are deeply in love with someone today, it is because of the love you had for this person in your past lives and the same goes for the hatred you have towards another person. This is an irresolvable problem.
Say, you have carried over 20% of the hatred for another person from your past life that resembles a detonating fuse, and if you do not understand the principle behind and start lighting up the fuse everywhere you go, the degree of hatred between you and that person will increase to 60%–80% in your next life. This is how hatred comes about.
Source: Master Jun Hong Lu’s Buddhism In Plain Terms, Volume 4 Chapter 35