“Therefore, having this ministry by the mercy of God, we do not lose heart. But we have renounced disgraceful, underhanded ways. We refuse to practice cunning or to tamper with God’s word, but by the open statement of the truth we would commend ourselves to everyone’s conscience in the sight of God. And even if our gospel is veiled, it is veiled only to those who are perishing. In their case the god of this world has blinded the minds of the unbelievers, to keep them from seeing the light of the gospel of the glory of Christ, who is the image of God. For what we proclaim is not ourselves, but Jesus Christ as Lord, with ourselves as your servants for Jesus’ sake. For God, who said, “Let light shine out of darkness,” has shone in our hearts to give the light of the knowledge of the glory of God in the face of Jesus Christ.” (2 Corinthians 4:1-6, ESV)
One of the most beautiful aspects of the Gospel is the fact that it is simple and straightforward. The preacher of the Gospel does not have to try to trick people into believing something without evidence, nor does he have to explain away things in the Bible that contradict what he believes. The truth is open and above-board in every sense and its preaching brings light and freedom in Christ.
There will be some who will not listen, and others who will hear but claim to not see. Some do not want to know what God says, others are blinded by their own assumptions and opinions. Even in such instances the Gospel of truth is available if such individuals change their hearts and want to see it.
We cannot preach ourselves or our own doctrine, for our beliefs and preferences do not matter. All we can preach is Jesus Christ as Lord, because we are his servants. If we do so, God will be glorified, the truth verified, and the faithful hearer sanctified.