Ascetic life and teaching
Sources describe his discipline as severe. In place of bread he is said to have eaten dry grass, which he crushed with a piece of marble. Asked how much a monk ought to sleep, he held that even half an hour was sufficient for a true monk, and he taught that to subdue the flesh a monk must practice two virtues above all: fasting and vigil.
The synaxarion relates that he received the gifts of unceasing mental prayer and of divine revelations, and that he experienced visions associated with Saint Maximus of Kavsokalyvia, in whose former cave he dwelt. The igumen Neophytus is said to have handed Acacius his own staff and to have asked him to serve as superior of the brethren until his last breath.