"In meekness instructing those that oppose themselves; if God peradventure will give them repentance to the acknowledging of the truth" -- 2 Timothy 2:25
If God gave all men saving grace, all men would be saved. Christ's atonement is sufficient for all the world, and efficient only for those whom God has graced with faith in Him.
Salvation by His grace through faith in Christ, as Paul tells us in Ephesians 2, is not of ourselves. It is a gift from God.
Acts 17:
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God has overlooked the times of ignorance, but now he demands that all people everywhere repent
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because he has established a day on which he will ‘judge the world with justice’ through a man he has appointed, and he has provided confirmation for all by raising him from the dead.”
All people. God demands that all people everywhere repent.
Repentence is enabled by God’s Grace. Salvation also comes from God. We are grateful that the Reformed understand this. At least some of our teaching has made it through.