Though he fall, he shall not be utterly cast down This verse has generally been interpreted proverbially, and as meaning, that though the righteous may fall into sin, his fall is not deadly; but this is not at all in accordance with the design of the prophet, who is discoursing of the happiness of the godly. The simple meaning is, that when God visits his servants with severe afflictions, he at the same time mitigates them that they may not faint under them; [1] as Paul declares, "We are persecuted, but not forsaken; cast down, but not destroyed."-- (2-Corinthians 4:9) Some say that the righteous are not utterly cast down, because they lose not their courage, but rather bear with invincible fortitude whatever burden is laid upon them. I readily admit that the reason why they are not overwhelmed is, that they are not so tender and delicate as to sink under the burden. I, however, understand the words in a more extensive sense, and explain them thus: That the miseries of the godly are so tempered with God's fatherly mercy, that they fail not under their burden, and even when they fall, sink not into destruction. From these words we learn that the godly, although they serve God sincerely, and study to lead a blameless life, are not suffered to continue unmoved, and always in the same condition, but are often afflicted and cast down by various trials; and that the only difference between them and the unbelieving is, that their falls are not deadly. We know that if God smite the reprobate, though it be but very slightly, it becomes the cause of their final destruction. Solomon speaks still more expressly when he says, "For a just man falleth seven times, and riseth up again," (Proverbs 24:16,) and by these words he teaches us, that the godly are not only subjected to frequent afflictions in this life, but that they are visited with daily trials, and yet are never forsaken of the Lord. We must also shortly observe, that even the slightest fall would be enough to destroy us utterly, did not God uphold us by his hand.

Footnotes

1 - "Neither the text," says Dr Adam Clarke, "nor any of the versions, intimate that a falling into sin is meant; but a falling into trouble, difficulty," etc.

Though he fall - That is, though he is sometimes disappointed; though he is not always successful; though he may be unfortunate - yet this will not be final ruin. The word here does not refer to his falling into "sin," but into misfortune, disappointment, reverses, calamities. The image is that of a man who is walking along on a journey, but who stumbles, or fails to the earth - a representation of one who is not always successful, but who finds disappointment spring up in his path.
He shall not be utterly cast down - The word used here - טול ṭûl - means to "throw down at full length, to prostrate;" then, "to cast out, to throw away." Compare Isaiah 22:17; Jeremiah 16:13; Jeremiah 22:26; Jonah 1:5, Jonah 1:15. Here it means that he would not be "utterly" and "finally" prostrated; he would not fall so that he could not rise again. The calamity would be temporary, and there would be ultimate prosperity.
For the Lord upholdeth him with his hand - It is by no power of his own that he is recovered, but it is because, even when he falls, he is held up by an invisible hand. God will not suffer him to sink to utter ruin.

Though he fall, he shall not be utterly cast down - The original is short and emphatic כי יפל לא יוטל ki yippol, lo yutal, which the Chaldee translates, "Though he should fall into sickness, he shall not die;" for which the reason is given, because the Lord sustains by his hand. Though he may for a time fall under the power of his adversaries, as the Jews have done under the Babylonish captivity, he shall not be forsaken. The right hand of God shall sustain him in his afflictions and distresses; and at last God will give him a happy issue out of them all. Neither the tent nor any of the Versions intimate that a falling into sin is meant; but a falling into trouble, difficulty, etc.

Though he (q) fall, he shall not be utterly cast down: for the LORD upholdeth [him with] his hand.
(q) When God exercises his faith with various temptations.

Though he fall,.... Into temptation, and by it into sins, and these very great ones; from a lively and comfortable exercise of grace, and a degree of steadfastness in the doctrine of grace:
he shall not be utterly cast down; because he is in the arms of everlasting love, and in the hands of Christ Jesus; is on him as the sure foundation, and is kept by the power of God through faith unto salvation, and so shall not perish, but have everlasting life;
for the Lord upholdeth him with his hand; with the right hand of his righteousness, and keeps him from falling finally and totally; see Isaiah 41:10; and See Gill on Psalm 37:17.

Fall - Into trouble.