I heard from my brother that the final and most challenging test for a Mu’min and Muslim is resisting the temptation of the opposite gender and avoiding Zina. Is this true?

BrothertestTemptationGenderZinaSalam alaikum
I heard from my brother that the final and most challenging test for a Mu’min and Muslim is resisting the temptation of the opposite gender and avoiding Zina. Is this true?
Amina Inloes, Amina Inloes is originally from the US and has a PhD in Islamic Studies from the University of Exeter on Shi'a hadith. She is the program leader for the MA Islamic Studies program at the... Answer updated 10 months ago

It tends to be a big challenge for people, especially in youth. Often, as people get older, that particular temptation becomes less, and other temptations come to the forefront. (Exceptions apply!)

However, although that is a common temptation, there is no one single challenge that everyone faces equally - our temptations are as diverse as ourselves. Possibly, your brother is going through a difficult time managing this aspect of himself, and this is why he said that.