But for that reason I was mercifully treated, so that in me, as the foremost, Christ Jesus might display all his patience as an example for those who would come to believe in him for everlasting life.
Whoever believes in the Son of God has this testimony within himself. Whoever does not believe God has made him a liar by not believing the testimony God has given about his Son.
We also know that the Son of God has come and has given us discernment to know the one who is true. And we are in the one who is true, in his Son Jesus Christ. He is the true God and eternal life.