Thank you. Plus, that's supposed to be much less of a question now. It supposedly starts with nature (DNA, countless generations of evolution), then a child begins to be themselves, their environment "reacts" to them, and this nurturing shapes them, and goes on in a repeating cycle until their oldest/most solid traits solidify, and the process is slowed dramatically. It's an oversimplification of what's going on, but it portrays it well enough.

Nature always plays a part, we are animals... but our environment means everything as children.

That being said, as a side-note, due to our pre-frontal brain in maturity we also one day get additional power to take direction into our own hands. We can eventually have the power of won't to face our will, nature or nurture based. It just takes energy this way, and do we really want to put our trust in artificial motivation?

Program ALL the young minds, that's what I say. The world is barely natural anymore anyway.