How to differentiate between needs, dreams and desires

Sadhviji discusses the difference between needs, dreams & desires explaining that needs are when we can’t imagine being able to live without it. There is nothing wrong with dreams & desires as they fuel life, however the only problem comes when we feel like they aren’t being fulfilled. We become disappointed and then we suffer. She advises that instead of wondering is this a need, dream or desire, we should look internally and ask how high or low is this need, dream or desire. Is this from a place of my greater self, rather than from my smaller self?