" temptation cannot cross the limit set to it by the divine good pleasure; it always has a providential purpose; it attacks us on our weak side, and obliges us to fortify that; it instructs us, spurs us on, crushes pride, excites to prayer, calls for austerities and elicits great resolutions; thus the demon becomes, in his own despite, one of the most active agents of our union with God. "

― Vitalis Lehodey , The Ways of Mental Prayer