"In order that all your desires are fulfilled, you should become desire less"
Once you let go, and let God -it all becomes doable!
For example, I could believe that I will only be happy if I have that car or that relationship, this is attachment to things.
When I realize that happiness and joy comes from within then I am not dependent on anything else for my state of being.
Then I am free from attachment and am more likely to experience joy from all relationships and all things regardless, a paradox of course.