The attempt to live by the reality of our own nature, which means our limits as well as our potentials, is a profoundly moral regimen. - Parker Palmer

If the engineer does not honor the nature of the steel or the wood or the stone, his or her failure will go well beyond aesthetics: the bridge or the building will collapse and put human life in peril.
The human self also has a nature, limits as well as potentials. If you seek vocation without understanding the material you are working with, what you build with your life will be ungainly and may well put lives in peril, your own and some of those around you. “Faking it” in the service of high values is no virtue and has nothing to do with vocation. It is an ignorant, sometimes arrogant, attempt to override one’s nature, and it will always fail.

I was fired because that job had little to do with who I am, with my true nature and gifts, what I care and do not care about. My resort to adolescent rebellion reflected that simple fact. … I was laughing to keep myself sane. Perhaps the research I was doing was what a good sociologist “ought” to do, but it felt meaningless to me, and I felt fraudulent doing it. Those feelings were harbingers of things to come, things that eventually led me out of the profession altogether. Obviously I should have dealt with my feeling more directly and exercised more self-control. Either I should have quit that job under my own steam or settled in and done the work properly. But sometimes the "shoulds" do not work because the life one is living runs crosswise to the grain of one's soul. At that time of my life, I had no feeling for the grain of my soul and of which way was crosswise. Not knowing what was driving me, I behaved with blind but blissful unconsciousness—and reality responded by giving me a big and hard-to-take clue about who I am.

Our strongest gifts are usually those we are barely aware of possessing. They are a part of our God-given nature, with us from the moment we drew first breath, and we are no more conscious of having them than we are of breathing.