"ascesis : (Rigorous) self-discipline, particularly as a religious observance;..."

“ascesis : (Rigorous) self-discipline, particularly as a religious observance; asceticism.
(Christianity, chiefly Eastern Orthodoxy, specifically) The praxis or “exercise” of asceticism and self-denial of impulses or passions for the sake of piety, theosis, and connection with God.”

- https://en.wiktionary.org/wiki/ascesis#English

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