Ascetic life and hesychasm
Joseph is remembered above all for the rigor of his pursuit of inner prayer. Accounts of his life describe long nightly vigils in which he recited the Jesus Prayer for hours from sunset, austere sleep taken sitting in a chair rather than lying in a bed, and a diet reduced in the wilderness huts of St Basil to a few ounces of rusks a day, sometimes with boiled wild greens.
His teaching centered on watchfulness (nepsis) and the continual invocation of the name of Jesus, the heart of the hesychast tradition. The lives transmitted by his disciples relate that, after a period of struggling without a guide, he received the gift of ceaseless prayer, a turning point recounted in the traditional accounts of his life.