We know also that the Son of God has come and has given us understanding, so that we may know him who is true. And we are in him who is true--even in his Son Jesus Christ. He is the true God and eternal life. I John 5:20
For I resolved to know nothing while I was with you except Jesus Christ and him crucified. I Cor. 2:2
I tell you the truth, we speak of what we know, and we testify to what we have seen . . .John 3:11
They said to the woman, "We no longer believe just because of what you said; now we have heard for ourselves, and we know that this man really is the Savior of the world." John 4:42