To me predestination can mean the founding and operation of the church and Jesus and his life, death and resurrection on earth. Truly it can also relate to the
life of the believer as he walks in the ways of Jesus. It is scary to me in that I am a sinner by birth and by nature. This makes me subject to the same problems
and thus maybe I will not measure up as a true believer and will therefore note fall into the plan and will end up in hell.
It is comforting in that if I am a true believer my destine will be set in stone and I will wind up in heaven with Jesus.
Paul brings up this subject in an effort bring about a better understanding of God's wisdom, forethought and purpose.
Paul is attempting to bring unity to the Ephesians.