Are you talking about the difference between "want" and "need"?
For most... somewhere in the back of their mind, ice cream is there, and they want it, they always want it... but it's a latent desire. They know about it, they've had it before, they will eventually have it again. Then someone says it's available, or they're about to go to the ice cream store... you no longer "want" ice cream... instantly you "need" ice cream. There's a mysterious part of the brain, which using algorithms that are only understood by the adversary, which subtly change the wiring in our "desire" matrix, (his favored tool was evidently many years of mind numbingly innocuous cereal commercials), but I digress... In short, he has managed to supplant a simple "want", with the much more demanding, yea even irresistible "need". Although many have managed to resist this "update" to their brain, in most it has taken hold, and in it's insidious way, has spread through out the brain taking over other functions as well. Thus, this newly created and mostly irresistible compulsion, is simply the joining of a "want" and a "need"... or as referred to by the adversary, a "weed". This is only one of the adversary's many masterpieces... the ability to have a latent desire, or "want", that upon hearing a select word or phrase, is instantly changed to a "need". Unfortunately, once the "weed" algorithm is introduced to the fertile soil of the mind, it's virtually impossible to be rid of.
Best of luck to you Fether. 😎