This is a fantastic question. I'll try to answer without complicating issues. I'll be using my own terminology but the concepts are developed in multiple sources by Jews, Greek Orthodox, Freud, and other psychologists.
We are born with a selfish inclination, remember Scott Peck's self-consciousness? This is necessary for the self-preservation of every infant but it doesn't care about the well-being of others. Around the age of 2, we _start_ to develop our will, which is like the reigns of a horse, that stop us for infringing on others. And later still, perhaps between age 5-7 we _start_ to absorb societal and religious norms, developing a social conscience.
A healthy, unfractured, will can regulate the activity of the selfish inclination. To obtain this, our spirit which otherwise remains dormant, must be reborn from above by the Holy Spirit.
What do you think of this? Is it something that makes sense to you? What do you believe constitutes the human person? Is this something you discussed with your therapists; Christians or non-Christians?