When I live by the holy spirit, it allows God to transform my spirit and my mind. Gods wisdom is given and I slowly become a new creation. When I walk in the flesh, there is not much difference between the world around me, my thinking is worldly, my desires are worldy, but when I live by the holy spirit, Gods wisdom is taught to me by the holy spirit so that I might have the mind of Christ.
Therefore, if anyone is in Christ, he is a new creation. The old has passed away; behold, the new has come.