John Calvin Commentary Hebrews 10:36

"For ye have need of patience, that, having done the will of God, ye may receive the promise." — Hebrews 10:36 (ASV)

For ye have need of patience, etc. He says that patience is necessary, not only because we have to endure to the end, but also because Satan has innumerable arts by which he harasses us; and therefore, unless we possess extraordinary patience, we will be broken down a thousand times before we reach the halfway point of our course.

The inheritance of eternal life is indeed certain to us; but, as life is like a race, we should continue towards the goal. However, on our path there are many hindrances and difficulties, which not only delay us but would also stop our course altogether, unless we had great firmness of mind to pass through them.

Satan craftily suggests every kind of trouble to discourage us. In short, Christians will never advance two paces without fainting unless they are sustained by patience. This, then, is the only way or means by which we can firmly and constantly advance; otherwise, we will not obey God, nor even enjoy the promised inheritance, which is here by metonymy called the “promise”.