The Witness Of The Spirit
Most Relevant Verses
"And we are witnesses of these things; and so is the Holy Spirit, whom God has given to those who obey Him."
The Spirit Himself testifies with our spirit that we are children of God,
The one who believes in the Son of God has the testimony in himself; the one who does not believe God has made Him a liar, because he has not believed in the testimony that God has given concerning His Son.