One must not think that a person who is suffering is not praying. He is offering up his sufferings to God, and many a time he is praying much more truly than one who goes away by himself and meditates his head off, and, if he has squeezed out a few tears, thinks that is prayer.
Teresa of AvilaThe true penance comes when God takes away the soul's health and strength for doing penance. Even though I have mentioned elsewhere the great pain this lack causes, the pain is much more intense here. All these things must come to the soul from its roots, from where it is planted.
Teresa of Avila