"Not without reason has this verse [Psalms 70:1] been selected from out of the whole body of Scripture. ... ‘O God, incline unto my aid.’ ... This verse should be poured out in unceasing prayer so that we may be delivered in adversity and preserved and not puffed up in prosperity. You should, I say, meditate constantly on this verse in your heart. You should not stop repeating it when you are doing any kind of work or performing some service or are on a journey. Meditate on it while sleeping and eating and attending to the least needs of nature. This heart’s reflection, having become a saving formula for you, will not only preserve you unharmed from every attack of the demons but will also purge you of every vice and earthly taint, lead you to the theoria of invisible and heavenly realities, and raise you to that ineffably ardent prayer which is experienced by very few. Let sleep overtake you as you meditate upon this verse until you are formed by having used it ceaselessly and are in the habit of repeating it even while asleep."