Being sure of New Birth

Whosoever shall confess Jesus is the Son of God, God dwelleth in him, and he in God.   1 John 4:15

Giving Thanks unto the Father...who hath delivered us from the power of darkness.   Colosians 1:12,13

The Spirit itself beareth witness with our spirit that we are the children of God   Romans 8:16

Summary

After you have invited Jesus into your life you can be sure He is there. The Bible tells us He is and we just know on the inside of us through our own spirit!