“And make straight paths for your feet” (Prov 4:26), “so that what is lame may not be turned aside, but rather be healed.” Here he speaks as though to swift runners, just as he said above, “Let us run with endurance.”
Therefore he says, “Make straight paths.” A “path” is either the track of a running chariot imprinted on the ground, or the place beneath the feet of runners.
Thus he says, let your paths, or your ways, be easy and level. That is, let there be nothing rough, sorrowful, or uneven in your souls. Walk straight, without grief and with ease.
Do this so that, being lame, that is, naturally disposed to excessive faintheartedness, as the Jews were, for such is this people, or lame with regard to faith in the future, you may not be forced to wander.
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Otherwise your feet, that is, you yourselves, would be turned aside from the way and become altogether wicked. A man overcome by natural faintheartedness, or by one that happens at the beginning, may fail to strengthen himself and yield to it more and more.
Then, quite imperceptibly, he reaches the extreme degree of despair, so that it becomes difficult to restrain him from it. Instead, strive that your lameness may be healed more quickly. That is, if you still have any unbelief, correct yourselves quickly.
For what place is there for unbelief in one who is patient? Notice how clearly he introduces the thought of repentance, and note that this is for the sake of the Novatians.