From The 12 Steps to Holiness by St. Alphonsus Liguori
'Except they do penance for their deeds' says Holy Scripture, 'they shall be in very great tribulation.'
'Souls that truly love God,' says St. Teresa, 'have no desire for bodily rest and indulgence.' ...by mortification may we attain great glory in Heaven.
Our present tribulations are momentary and light, but they 'work for us above measure exceedingly an eternal weight of glory.'
If you, Christian soul, desire to become holy and enjoy uninterrupted peace, strive as often as you can to mortify your will. Do nothing for your own satisfaction, but everything to please God.