It is sufficient for you to look into your faults, rather than into others.
If you think you don't have any faults, then better know that you are a loser.
If you think you don't have any faults, then better know that you are a loser.
"..."
Volume 7, Book 65, Number 359: Narrated Ibn 'Umar: The Prophet said, "There is a tree among the trees which is similar to a Muslim (in goodness), and that is the date palm tree."