Romans 2:15; Romans 8:16; Romans 9:1

Romans 2:15

15 in that they show the work of the Law written in their hearts, their conscience bearing witness and their thoughts alternately accusing or else defending them,

Romans 8:16

16 The Spirit Himself testifies with our spirit that we are children of God,

Romans 9:1

1 I am telling the truth in Christ, I am not lying, my conscience testifies with me in the Holy Spirit,