Among several acute observations:
“…any virtue will do. Satan can make use of any of them and will seek to corrupt all of them, even the religious ones. He will just as surely go to work in the life of someone in a church pew, as in a brothel or the gutter. No one is exempt from his work of temptation; his goal is to drag us to Hell.” — Satan at His Most Subtle: A Reflection on the Temptations and Traps of the Pious, by Msgr. Charles Pope
This is short, and well worth reading.