Hebrews 10:36

For ye have need of patience - They were then suffering, and in all trials we have need of patience. We have need of it because there is in us so much disposition to complain and repine; because our nature is liable to sink under sufferings; and because our trials are often protracted. All that Christians can do in such cases is to be patient - to lie calmly in the hands of God, and submit to his will day by day, and year by year; see James 1:3; notes, Romans 5:4.

That after ye have done the will of God - That is, in bearing trials, for the reference here is particularly to afflictions.Ye might receive the promise - The promised inheritance or reward - in heaven. It is implied here that this promise will not be received unless we are patient in our trials, and the prospect of this reward should encourage us to endure them.