Desert Fathers

[Syncletica] also said, 'When the devil does not use the goad of poverty to tempt us, he uses wealth for the same purpose. When he cannot win by scorn and mockery, he tries praise and flattery. If he cannot win by giving health, he tries illness. If he cannot win by comfort, he tries to ruin the soul by vexations that lead us to act against our monastic vows. He inflicts severe sicknesses on people whom he wants to tempt and so makes them weak, and thereby shakes the love they feel towards God. …

The Desert Fathers, Sayings of the Early Christian Monks ↗