ascesis

noun2

1. •
   self-discipline, particularly as a religious observance; asceticism.

   • Unlike dreams, visions tend to remain in one's memory, especially those experienced in meditative and related forms of asceses. — 2012
2. •
   The praxis or "exercise" of asceticism and self-denial of impulses or passions for the sake of piety, theosis, and connection with God.