Sin begins with the mind and it is through the mind that we can (with God’s help) begin our resistance to it and the fallen world in general. Drive through any major city and you will see places that you really should not go to, but it is your choice as to whether you will stop and enter it or not. It is your choice to take that drug or not. It is your choice to engage in premarital sex or not. All of the temptations may be great and the world, through the media or even your friends, may be leading you in the wrong direction, but it is your mind where the real choice is made.