Desire → Actions
Actions require desire. Everytime you act, you act because of your desires.
Example
If I put a bill into a vending machine, I am doing so because I want a candy bar.
Versions
Lesser Version
Desires can come after motivation is set. Beliefs are the only input for motivation and desire will follow afterwards as a byproduct
Rigorous Version
Desires and beliefs must both exist as inputs before motivation can be met.