I heard from the Holy Spirit long before I knew anything in the bible. I never knew anything about Jesus until one night when the Holy Spirit came to me and revealed who Jesus was, and THEN he told me to get a bible and read it. Afterwards, reading the bible, I saw what happened was what Jesus said would happen to beleivers after he rose from the dead, that he would give the Holy Spirit out.
That is a witness and a sign to you that what the bible says is true, as a Christian, that does not lie, as lying is a sin, what gain would I have in doing so?
“If I testify about myself, my testimony is not true. There is another who testifies in my favor, and I know that his testimony about me is true. “I have testimony weightier than that of John. For the works that the Father has given me to finish—the very works that I am doing—testify that the Father has sent me. And the Father who sent me has himself testified concerning me. John 5
This was Jesus testimony, and not only did he have the Father as his witness, but his works displayed himself as the son of God, in the same way, my works, which you have not seen because you do not know me personally, display myself to be a true christian.