"ARE YOU FOR REAL IN YOUR BELIEF"
1 Jn 5:10-11
10 He who believes in the Son of God [who adheres to, trusts in, and relies on Him] has the testimony [possesses this divine attestation] within himself. He who does not believe God [in this way] has made Him out to be and represented Him as a liar, because he has not believed (put his faith in, adhered to, and relied on) the evidence (the testimony) that God has borne regarding His Son.
11 And this is that testimony (that evidence): God gave us eternal life, and this life is in His Son.