You have brains in your head. You have feet in your shoes. You can steer yourself in any direction you choose. You"re on your own, and you know what you know. And you are the guy who"ll decide where to go.
A man who has been in another world does not come back unchanged. One can"t put the difference into words. When the man is a friend it may become painful: the old footing is not easy to recover.