He who does not voluntarily avoid the cause passions, unwillingly, he is attracted to sin. And causes of sin are: wine, women, wealth and the health of the body. Not that they are sins by nature, but they make that the nature easily incline towards sinful passions. And that is why man must guard them at all costs. If you always keep in mind your weakness, you will not cross the line.

(Translated from Sfântul Isaac Sirul, Cuvinte despre nevoință, Editura Bunavestire, Bacău, 1997, p. 42)