He who sins is of the devil, for the devil has been sinning from the beginning. To this end the Son of God was revealed, that he might destroy the works of the devil.

 In the New Testament there is the idea of adoption ( Romans 8:14-17; 1 Corinthians 1:9; Galatians 3:26-27; Galatians 4:6-7). Here is the idea that by a deliberate act of adoption on the part of God the Christian enters into his family. 