You must have experienced a kid asking for toys, game boy, toy planes, puppets etc...as he grows his desires moves a level up and demands for an electronic bike, new set of mobile handset, advanced playing system etc....all these desires are limited to his perception, a kid cannot desires what he has not perceived.
Very close to a kid we also desire many such items associated to the materialistic world. In a YOGI view these are also toys and like a kid we keep running after all those desires which our mind perceives.
In true sense our desires are limited to our perception; none can desire what he has not perceived. One need to gather the thoughts, learn to focus, and improve the horizon of perception towards Yogic thoughts.
You will experience your desires converging towards a sensible goal, which is in search of basic questions like who am I , What am I doing? For whom I am worried? Etc…