When I read Paul saying, "...the world has been crucified to me and I to the world," (Galatians 6:14), I could not help but remember the Desert Fathers a few centuries later who spoke of going to the desert as a way of escaping a shipwreck of a society. In both cases the word is separation. Both realized life in Christ and life in society is not possible. Of course, this sounds strange because everything we have learned about the Christian life calls us to be the presence of Jesus in the world.
We remember, too, something Jesus said in the passage known as the High Priestly Prayer. As we read John 17:14-16 we hear Jesus praying, "I have given them Your word, and the world has hated them because they do not belong to the world. I am not asking You to take them out of the world, but I ask You to protect them from the evil one. They do not belong in the world, just as I do not belong in the world." Again we find a word about separation and belonging. What Paul was declaring is that we cannot allow ourselves to be influenced, directed, and controlled by the values of the world and for Paul the only way to maintain this way of life was to consider himself one to whom the world had been crucified which means it, therefore. no longer has any bearing on how he lives.
The Apostle Paul calls us in many places to the surrendered life, the abandoned life, the life where all that matters is serving and living for Christ. The kind of crucifixion of which Paul speaks is one where things like accumulating, looking out for number one, and climbing some ladder which makes us feel more important no longer have any influence over us. The kind of crucifixion of which Paul speaks is the one where the Holy Spirit has absolute control over our heart. Only then is our self seeking and self serving ego crucified.