Why Are Some People Difficult?

The difference between people is the reason why we are in this world, to be tested and to see if we can overcome it. 

It’s so important that this world wouldn’t be a world without it. And our success during our stay in this world and our whole future life in Olam Haba (The World to Come), depend on our success in withstanding the ordeals. Can we get along? — Living with Others (#R-4)