Baal HaSulam, Letter 11: And I am asking you to do your greatest efforts in intensifying the love of friends and to think of ways to increase the love among friends, and to annul the passion for bodily pleasures, since this is the cause of hate. And among those who bring contentment to their Creator there can be no hate but rather greater compassion and love among them, and it is very simple.
And you should listen to my words from now on, since your life depends on this.
Question: How should we correct our attitude towards the friends that arouse hatred in us?
Answer: You should love the friends that you hate now, and that’s it. You have to reach a state that they become important for you, dearest, closest and most desired. But at the same time, the hate towards them should be kept.
The hate remains below, and you have to constantly worry about correcting it and building the love above it. This is how the spiritual tension is determined. You discover spirituality in the point between hate and love, between these two forces!
There is not just love or hate. Both love and hate come from the Light that illuminates one way or another, but you find and discover yourself in adhesion to the Creator, between these two feelings.
From the 1st part of the Daily Kabbalah Lesson 2/3/13, Writings of Baal HaSulam