What is the remedy for temptation (fitna) by looking at girls?

A Muslim must lower his gaze from what Allah has forbidden, as Allah Almighty says: "Tell the believing men to lower their gaze and guard their private parts. That is purer for them. Indeed, Allah is Acquainted with what they do." The first permissible glance is only a sudden glance. Allowing forbidden gazes is dangerous; it is the heart's messenger to zina (unlawful sexual intercourse) and its zina, and a cause for a decrease in faith. Lowering the gaze is evidence of strong faith and a reason for its increase. It is a poisoned arrow from the arrows of Iblees (Satan), and whoever abandons it for fear of Allah will find the sweetness of faith in his heart. The cure for this tribulation is to reflect on the harms resulting from it.