Before he was a monk, John Main trained and practiced as a lawyer and then entered Britain's colonial diplomatic service, which posted him to Malaya in the 1950s. There, attached to the office of a colonial governor, he met Swami Satyananda, an Indian monk and Justice of the Peace, who taught him a simple form of meditation centered on the silent, continuous repetition of a single sacred word or phrase, a practice Main described later as unlike anything in his own Catholic upbringing yet, once he examined it, deeply consonant with the tradition of Christian contemplative prayer he began studying more seriously afterward.
He entered the Benedictine community at Ealing Abbey in London in 1958 and was ordained a priest, but for some years set the meditation practice itself aside, occupied instead with more conventional monastic duties, including a period teaching law at Trinity College, Dublin, at his order's direction.
He returned to the practice in the 1970s, this time explicitly reframing it within a Christian devotional vocabulary rather than presenting it as an imported technique, and became convinced that a discipline of silent, word centered meditation, far from being foreign to Christianity, recovered something present in the early Christian contemplative tradition, particularly in the teaching of the fourth century monk John Cassian, that Main believed later Western Christianity had largely lost touch with in practice even where it remained present in theory.