"You have heard that it was said, 'Eye for eye, and tooth for tooth.' But I tell you, Do not resist an evil person. If someone strikes you on the right cheek, turn to him the other also."
Have you ever wanted to "put someone in their place?" Maybe they have been a little pious or had a smug, self-righteous attitude, and then you just want to put them right where they belong. Possibly there has been someone who has been taking advantage of others for a long time, and then you get your chance. You know that you can "rightly" take advantage of them.
But citizens of the Kingdom are different. They trust their King. They know that vengence belongs to Him, and He will repay. They can sit back and relax, knowing that whatever comes their way is from the king, and He wants to use if for good in their lives. The citizens of the Kingdom can repeat after Joseph, who, when he had been sold into slavery by his brothers, told them later in life, "What you meant for evil, God meant for good."