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The safest and most suitable form of penance seems to be that which causes pain in the flesh but does not penetrate to the bones, that is, which causes suffering but not sickness.

Saint Ignatius of Loyola (2012). “The Spiritual Exercises of Saint Ignatius of Loyola”, p.40, Courier Corporation
The safest and most suitable form of penance seems to be that which causes pain in the flesh but does not penetrate to the bones, that is, which causes suffering but not sickness.