Statement of Ibn al-Qayyim:
“Ward off passing thoughts, for if you do not, they will become ideas. Ward off ideas, for if you do not, they will become desires. If they become desires, fight them, for if you do not, they will become resolve and determination, and if you do not ward them off, they will become actions. If you do not resist them with their opposite, they will become habits and it will then be difficult for you to get rid of them.”