^Gethin (1998), pp.186-187; and, Rhys Davids & Stede, op. cit.
^For instance, in the Kālāmā Sutta (AN 3.65), the Buddha speaks of all Noble Disciples (ariya-savaka) developing the brahmaviharas (Thanissaro, 1994).
^Kālāmā Sutta (AN 3.65), trans. Thanissaro (1994). The "four directions" refer to east, south, west and north.
^AN 3.65 (Thanissaro, 1994). In regards to in which heavenly realm a frequent karuṇā dweller will be reborn, AN 4.125 (Thanissaro, 2006) identifies it as the realm of radiant (abhassara) devas, whose lifespans last two eons.