If we look at this picture it shows us where passion truly rises from. True passion comes from inspiration, if we take the work inspire it means (in spirit).
Our true passions come from the spirit inspiring us, to be an instrument to be used to facilitate healing, inspiration, etc... spirit created us so it knows what activities would bring us the most fulfillment and joy.
Ask yourself where do I feel most inspired? What activities bring me a sense of timelessness? Remember that your passion will be used by spirit we just have to let it work through us instead of us trying to make work. A passion never feels like work if it starts to ask for an inspired action.