Ibn al-Qayyim said, "Let the judicious be aware that the addicts of desires end up not enjoying them, still, they cannot abandon them."
Hilyatul Awliya 7/68
Sufyan at-Thawri was asked about the saying of Allah, "And man was created weak." What is meant by weak?
He replied, "A woman passes by a man, and the man can not prevent himself from looking at her, and he attains no benefit (by looking at her), is there anything weaker than this?"