"Stand firm against evil thoughts... for if you fail
to do so, they will become ideas, if you do not, they will become desires, so
fight against them. If you do not, they will become a form of determination and
intention. If you do not resist, they will become actions, and if you do not
follow them up with their opposite, they will become habits that will be hard
to quit."
(Imaam Ibnul-Qayyim – Al-Fawa’id: A
collection of wise sayings pg.54)