Put two texts together, and see what you see.
“God desires all people to be saved and to come to the knowledge of the truth (eis epignōsin alētheias)” (1 Timothy 2:4).
“God may perhaps grant them repentance leading to a knowledge of the truth (eis epignōsin alētheias)” (2 Timothy 2:25).
Here’s what I see:
1. Though God desires all people to be saved, he “may perhaps grant repentance.” Which I think means that God’s desire for all to be saved does not lead him to save all. God has desires that do not reach the level of volition. They are restrained by other considerations — like his wisdom, which guides him to display his glory in the fullest way. He has his reasons for why he “may perhaps grant repentance” to some sinners, and not to others.
2. The “knowledge of the truth” is a gift of God. God “grants [i.e., gives] repentance leading to a knowledge of the truth.” Without the gift of repentance, we would not know the truth. This is evidently what 1 Timothy 2:4 means also: We must be “saved and [in that way] come to a knowledge of the truth.” Saved from our blindness to the truth.
3. Therefore the truth Paul has in mind is not truth that the natural man can see. But the natural man can see a lot of truth. Tens of thousands of truths are open to the natural mind. What truth can the natural man not see? The natural man cannot see the glory of Christ in the gospel. “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” (2 Corinthians 4:4).
4. This is why God must “grant” what it takes to see the truth of the gospel. We are blind to it. And Satan keeps us that way. Until God “grants” repentance (metanoia) — the change of mind that can see and receive the truth of the gospel.
5. Therefore, our prayers for the unbelievers we love, and our evangelism, should be driven by this one and only hope for their salvation: “God may perhaps grant them repentance.” Since he alone has the power to overcome spiritual deadness and Satanic blindness, we lay hold in prayer and witness on the truth: “God may grant repentance.” That is our only hope.
So let us follow Paul: “Brothers, my heart’s desire and prayer to God for them is that they may be saved” (Romans 10:1). And: “Faith comes from hearing, and hearing through the word of Christ” (Romans 10:17).