The idea of predestination may be hard for me to comprehend sometimes, but never scary. On the contrary, I find it very comforting to know that God had (and has) a plan for my whole life. That He had me in mind even back when I didn't know Him! I think Paul brings it up to show us that it's not how we were living before, but now that we should focus on. Gloryinging God now-God knew we were sinners before, but it didn't matter.