James 5:11 speaks of the endurance of Job, i.e., his patience and steadfastness during suffering. Patience does not mean that godly sufferers "should have no sadness, that they should not be at all offended when they experience some affliction; but the virtue is when they are able to restrain themselves and so hold themselves in bounds that they do not cease to glorify God in the midst of all their affliction, that they are not troubled by anguish and so swallowed up as to quit everything; but that they fight against their passions until they are able to conform to the good pleasure of God, and to conclude as Job here does, and to say that He is entirely just." - John Calvin, JOB, p. 19.

In Job 1:20-22, we see how deeply sorrowful a truly patient man can become:

"Then Job arose and tore his robe and shaved his head, and he fell to the ground and worshipped. And he said, "Naked I came from my mother's womb, and naked I shall return there. The LORD gave and the LORD has taken away. Blessed be the name of the LORD."