There is a Greek legend that says that when man was created, the father of the gods, Zeus, decided to give him two bags.
One bag contained the man’s own negative qualities while the other contained everybody else’s faults. Zeus hung these bags on a long pole. But he made a mistake because of which man is today what he is today. And do you want to know what that mistake was?
Zeus hung the bag that had other people’s faults on the front end of the pole while the bag that contained man’s own faults was hung further behind. So man was able to see other’s defects before he could see his own.
This is the reason why we tend to see the faults of others while we are hardly able to see our own.