the whole notion of the powerful effects of epigenetics over genetics in the development of personality is going to be treated unkindly by history. it is promulgated mostly by people who believe they are self-made successes who will go to heaven when they die.
of course we change our behaviors as we accumulate experience, otherwise why have a memory? but that is very much a second-level effect, and even the ability to change is limited by our genetic inheritance. when you remove the sentimental free-will bias toward life forms that life forms seem to get trapped in it becomes chemistry, and when you look in there it becomes mechanics, and that is no longer a suitable place for hopes and dreams — but it is a great place to learn something.
