David Amerland said this quote

When it comes to identity we are all constructs. Who we think we are is the result of our upbringing, memories, skill set, knowledge, experiences and personal belief system. Of all the onion layers that make us who we are, our belief system is what powers our core. It’s what creates the essence of a human being and makes it possible for each of us to exceed our limits, confound expectations and do the impossible.