When an unbeliever rejects the testimony of the follower of Christ, that unbeliever is rejecting Christ directly. By rejecting Christ, the unbeliever is rejecting the Father God directly.
Scientia, “Real Faith & Reason Journey”
DIRECT LINK TO BOOK – http://RealReality.org/Real_Faith_and_Reason_Vol_1_-_Scientia.pdf
This is because the testimony of Jesus Christ is the spirit of prophecy. The Holy Spirit is directly speaking through the follower of Christ if it is a true testimony and if the follower of Christ is following Christ at the moment. We are commanded to speak as the oracles of God. God tells us that whatever isn’t of faith is sin, and faith comes by hearing the utterance of God, and faith gives access to grace that speaks through us. In fact, no one can say, “Jesus is Lord” but by the Holy Spirit.