Equanimity is often taught as a complement to the practices of lovingkindness and compassion because it’s understood in Buddhist psychology that if we only practice lovingkindness and compassion, we can mistakenly get attached to the way we think things are supposed to be. We then might grasp and struggle with the world rather than serving it. Meditation can help us be steady and balanced in the midst of constant change.

Jack Kornfield on the Metta Hour with Sharon Salzberg – Ep. 59
Sharon and Jack Kornfield originally met in the 1970s in Colorado and went on to found the Insight Meditation Society