" Here then works begin; here he must not take his ease; here he must give heed to exercise his body by fastings, watchings, labour, and other regular discipline, so that it may be subdued to the spirit, and obey and conform itself to the inner man and faith, and not rebel against them nor hinder them, as is its nature to do if it is not kept under. For the inner man, being conformed to God and created after the image of God through faith, rejoices and delights itself in Christ, in whom such blessings have been conferred on it, and hence has only this task before it: to serve God with joy and for nought in free love. "
― Martin Luther , On Christian Liberty