The objection that Christians should take refuge in faith and scripture and forsake asceticism is without any merit. It is without mercy and has no power to help. What is a life of faith, if not an endless manifold struggle of the spirit against the flesh? How can anyone live in faith whom prayer makes slothful, who is tired of scripture, or whose joy in God is stolen by sleeping, eating, or sexual desire?
Bonhoeffer, D. (2003). Discipleship. (B. Green & R. Krauss, Trans., M. Kuske, I. Tödt, G. B. Kelly, & J. D. Godsey, Eds.) (Vol. 4, p. 160). Minneapolis, MN: Fortress Press.