ascetic

The stern ascetic rigor of the Temple discipline. --Sir W. Scott.
[1913 Webster]

Ascetic As*cet"ic, n. In the early church, one who devoted himself to a solitary
and contemplative life, characterized by devotion, extreme
self-denial, and self-mortification; a hermit; a recluse;
hence, one who practices extreme rigor and self-denial in
religious things.
[1913 Webster]

I am far from commending those ascetics that take up their quarters in deserts. --Norris.
[1913 Webster]

Ascetic theology, the science which treats of the practice of the theological and moral virtues, and the counsels of
perfection. --Am. Cyc.
[1913 Webster]

Source: The Collaborative International Dictionary of English