St. Jerome, Ep. to St. Eustochium: “We sail in a tempestuous sea that threatens us on every side, and in a poor leaky vessel: the devil, who aims at nothing less than our destruction, never ceases to increase the storm, to overwhelm us thereby, if he can; hence it was that the Apostle gave this precaution, even to the virtuous: ‘Let him that thinketh he standeth, take heed lest he fall’ (1 Cor. x.12).”