John Chrysostom
Scripture often draws consolation in calamities from ordinary phenomena. For example, the prophet says that He will deliver you "from heat, and for a refuge and shelter from storm and rain" Is 4:6. David says, "The sun shall not strike you by day, nor the moon by night" Ps 120:6.
So here the Apostle says that, just as a cloud by its shadow protects one whom burning rays scorch, so the remembrance of the saints restores and strengthens a soul weighed down by calamities.
He did not say, "hanging over us," but, "so great a cloud surrounding us." This means something greater, and shows that, by enclosing us all around, this cloud of witnesses makes us more secure.
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He calls witnesses not only the men of the New Testament, but also those of the Old. They too bore witness to God's greatness, as did the three youths, the contemporaries of Elijah, and all the prophets.
"Let us lay aside every weight." What does "every" mean? Sleep, negligence, base thoughts, everything human.
"And the sin which ensnares us." "Ensnares," he says, that is, either easily overcomes us or is easily overcome. The latter is better, since if we wish, we can easily conquer sin.
"And with patience," he says, "let us run the race that is set before us." He did not say, "let us wrestle," or "let us wage war," or "let us fight." Rather, he presents what is easiest on the course.
Nor did he say, "let us intensify the running," but, "let us be patient in the same running. Let us not grow weak." "Let us run the race that is set before us."