Equanimity is one of three qualities of mind that we want to develop if spiritual enlightenment is our goal. The other two are focus and clarity.
Equanimity as a quality of mind is helpful not only for meditation and insight but also for life satisfaction in general. With equanimity, we remain in a peaceful state regardless of the experiences we have at the moment. When pain arises, we are not swept away by our stories around it and remain aware of the sensations that arise and pass from moment to moment.