The devil and mortifications - St Philip Neri

"The devil has a crafty custom of sometimes urging spiritual persons to penances and mortifications, in order that by going indiscreet lengths in this way, they may so weaken themselves as to be unable to attend to good works of greater importance; or be so intimidated by the sickliness they have brought upon themselves as to abandon their customary devotions, and at last turn their backs on the service of God."