Paul says it best in Galatians 6:14

"...my interest in this world died long ago, and the world's interest in me is also long dead..."

I don't want to live for pleasing this world or the people in it and conform to their deeds and ways. I want to please God!

Truthfully I have WAAAY to much and many interests in this world and I'm not talking about my interests in singing or sewing or playing my keyboard or even watching movies for that matter...it's when my interests take up more time than I even give God. It's almost like I've made movies my god...I spend hours a week watching movies and in turn spend -0 with God! There is something wrong with that! So for some taking insterest in the world may be wild parties or the like but for me I have hobbies and things that in hind sight aren't going to be very important, taking time away from God. So interests can mean anything to anyone. But Paul was also meaning that if we make ourselves different from the "lost" they won't have any interest in us b/c we won't give them what they want. We will be trying to change them and they enjoy "darkness" over "light" so therefor their interest in us will be lacking and we have no interest in transfering to the "darkness" so we have no interest in their ways...however we'll always have an interest in the soul of the "lost" and hope and pray that God shed his grace on them.

I don't know if this makes sense but to me interest in the world is anything the world has to offer that you spend more time with and like more that God!

May grace and peace be yours ~Paul  /|\