We definitely don't come to this world with a perfectly clean slate. It is a seemingly clean slate but is embossed with a handful of adjectives that God wants us to be when we grow up. On the slate you can also find a generous sprinkle of assorted qualities which aid in making the embossed adjectives to eventually surface.
During the course of life, an observant and sensitive parent identifies the hidden qualities of the child and helps him to make the best out of his life. The child is ignorant (so is the parent) and thinks he's learning from his parents, friends, teachers, etc. He feels he's 'acquiring' the values and ideals, but in truth, it's his own slate which is shaping up, and he has no eyes to see it. All the world does for us is to help us in more than one ways to be what we are...But nobody can really 'change/teach' us unless we're inclined to do so...
I strongly believe that we are born with our values and ideals, and we use our surroundings to become the 'adjectives' that God wanted us to become when we were bz dreaming about him when in our mummie's tummie's!! LOL...Which explains why children of the same parents differ so much, 'coz they come with special customised handcrafted slates gifted by God!
However, on the other hand, when we put on our worldly glasses tinted with logic, it seems too silly to believe that we were born with our values. As my friends in Y! Answers Community have rightly written, that we dont' really learn french BEFORE coming to this world (common sense), and that we learn soo many things while we're living. Yes, it may be true to a certain extent that we acquire our values and ideals during the different stages of life as time goes by...
But I would still like to support my 'emotional' theory, as I like to believe that God directs us in every stage and everything is predetermined. Yes, we do become what we are as we grow, but unless he'd sprinkled those qualities with his generous hands, we'd have been mere robots doing exactly what our parents, teachers, friends, children, neighbours say! Each one of us has a different and unique mind, beautifully blooming (sincerely surprising) in every stage of life...=)