In a very real way the domain of the people we initially feel indifferent toward is the most generous and selfless domain of the path of metta. Cultivating metta with those we feel indifferent toward is an act of profound generosity and care. Indifference disappears in any moment we see another person wholeheartedly.
~ Christina Feldman
Boundless Heart: The Buddha’s Path of Kindness, Compassion, Joy, and Equanimity (Shambhala, 2017, p. 41)