Due to the fall, selfish men centered on their own individual purposes can't understand the purpose of the whole of all things. Because of this, they are unhappy. To have many keys means it is hell. In this fallen world, you can't do a great job by using common sense. Eventually you will be defeated.
False love is fake, man-centered and calculating love.
Marriage without God's true love eventually leads society into confusion. The time when everything is centered on egoistic and animal-like love is the Last Days. Though mankind has fallen seriously ill, people don't even know they are sick, so they don't know what kind of disease they have. If Satan tries to push God into a comer, eventually God ends up on top and Satan is in the comer. The love disease can't be cured by any worldly medicine.