When I get honest, I admit I am a bundle of paradoxes. I believe and I doubt, I hope and get discouraged, I love and I hate, I feel bad about feeling good, I feel guilty about not feeling guilty. I am trusting and suspicious. I am honest and I still play games. Aristotle said I am a rational animal; I say I am an angel with an incredible capacity for beer.
To live by grace means to acknowledge my whole life story, the light side and the dark. In admitting my shadow side, I learn who I am and what God's grace means. As Thomas Merton put it, "A saint is not someone who is good but who experiences the goodness of God."
Following your call in life--be it marital, parental, religious or single--can be done only with faith in self, fellow human beings and God. Check all three relations.