John Calvin Commentary Hebrews 6:3

"And this will we do, if God permit." — Hebrews 6:3 (ASV)

This will we do, etc. A dreadful denunciation follows. But the Apostle delivered this strong warning so that the Jews would not indulge their own complacency and treat God's favor lightly.

It was as if he were saying: “In this case, there ought to be no delay, for the opportunity to make progress will not always be available. It is not in human power to leap all at once, whenever one pleases, from the starting point to the goal; but progress in our course is the special gift of God.”