"When we take any of our strongly felt desires and construct our entire identity around it, we discover that we are making a part of who we are into the whole of who we are."
And to piggy back off of that thought:
"What we desire, whether noble or corrupted, is not the truest thing about us. Building our identity on the foundation of what we desire guarantees that our identity will change every time our desires change."
The Truest Thing About You, by David Lomas