Our identity is a complicated puzzle made up of many factors. For instance, I grew up in Asia so I am defined as a "third world kid." I feel most at home there but my home is here. Add to that the family each of us grew up in, our experiences through life, the education we received, the job we have and our station in life. No one of these is sufficient for identity but together they profoundly impact who we believe we are.
Now, I believe that God uses all of our history to craft who we are in the present and he uses the present to craft who we will be in the future. But at its core, our identity is all about who God created us to be in relationship with him rather than the external factors that we often falsely believe are our core identity.
For many men, their job defines their identity. What happens if the job goes away and I am unemployed? Did my core identity change? If my 25 year old son who is a strapping outdoors man were to suffer an accident that left him as a paraplegic did his identity change?
External factors in our lives are certainly important in shaping who we become when we allow the Holy Spirit to grow us. But our core identity is found in our son ship and daughter ship of the King of Kings. In the end we are more defined by our relationship with God than our jobs, our position or life experiences. All of those may be wonderful and may have had a part in forming us but many of these can go away. Our life "in Christ" can and will never be taken away. It is the core of our identity for all eternity.
Believing that and living it out changes everything.