We need to be especially alert to the evil subtlety of Satan. His one desire is to keep people from having a mind and heart disposed to their Lord and God.
He circles, lusting to snatch away the human heart by the ruse of some gain or assistance and to stifle remembrance of the word and precepts of the Lord.
He wants to extinguish the light of the human heart, and so he moves in by means of worldly busyness and worry.
Saint Francis of Assisi
Rule of 1221, Chapter XXII
with thanks to Portiuncula