Purpose vs Desire

What is known is a past, what is unknown holds all potential for you to tap into. How do you tell which is which? The other day I had a really insightful conversation with my friend over some Vietnamese food and he mentioned that ‘a purpose should feel like a ‘pull’ and not a ‘push’ , that really resonated with me!! With desire you are already or subconsciously expecting an outcome hence the desire is known, whereas the purpose is simply just a pull into the Unknown. Purpose is permanent and is spirallic in nature, desire is changeful and in many instances appear illusory.