John 3:7 “Do not be amazed that I said to you, ‘You must be born again.’ 8 The wind blows where it wishes and you hear the sound of it, but do not know where it comes from and where it is going; so is everyone who is born of the Spirit.” 9 Nicodemus said to Him, “How can these things be?” 10 Jesus answered and said to him, “Are you the teacher of Israel and do not understand these things? 11 Truly, truly, I say to you, we speak of what we know and testify of what we have seen, and you do not accept our testimony. 12 If I told you earthly things and you do not believe, how will you believe if I tell you heavenly things?”
The gospel of Jesus Christ is not a speculative message. When we spread the good news, we are not simply to offer our opinions. We are to “speak of what we know.” Calvin writes:
We speak what we know. Some refer this to Christ and John the Baptist; others say that the plural number is used instead of the singular. For my own part, I have no doubt that Christ mentions himself in connection with all the prophets of God, and speaks generally in the person of all. Philosophers and other vain-glorious teachers frequently bring forward trifles which they have themselves invented; but Christ claims it as peculiar to himself and all the servants of God, that they deliver no doctrine but what is certain. For God does not send ministers to prattle about things that are unknown or doubtful, but trains them in his school, that what they have learned from himself they may afterwards deliver to others. Again, as Christ, by this testimony, recommends to us the certainty of his doctrine, so he enjoins on all his ministers a law of modesty, not to put forward their own dreams or conjectures — not to preach human inventions, which have no solidity in them but to render a faithful and pure testimony to God. Let every man, therefore, see what the Lord has revealed to him, that no man may go beyond the bounds of his faith; and, lastly, that no man may allow himself to speak any thing but what he has heard from the Lord. It ought to be observed, likewise, that Christ here confirms his doctrine by an oath, that it may have full authority over us.
—John Calvin, Calvin’s Commentaries Volume XVII, Commentary on the Gospel according to John, Volume I (Baker Books, 2009), 117–118.









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