Psalms 121:3

Sing therefore what follows; if you wish to hear how you may most securely set your feet on the steps, so that you may not be fatigued in that ascent, nor stumble and fall: pray in these words: "Suffer not my foot to be moved!" [Psalm 121:3]. Whereby are feet moved; whereby was the foot of him who was in Paradise moved? But first consider whereby the feet of him who was among the Angels were moved: who when his feet were moved fell, and from an Angel became a devil: for when his feet were moved he fell. Seek whereby he fell: he fell through pride. Nothing then moves the feet, save pride: nothing moves the feet to a fall, save pride. Charity moves them to walk and to improve and to ascend; pride moves them to fall...Rightly therefore the Psalmist, hearing how he may ascend and may not fall, prays unto God that he may profit from the vale of misery, and may not fail in the swelling of pride, in these words, "Suffer not my feet to be moved!" And He replies unto him, "Let him that keeps you not sleep." Attend, my beloved. It is as if one thought were expressed in two sentences; the man while ascending and singing "the song of degrees," says, "Suffer not my foot to be moved:" and it is as if God answered, You say unto Me, Let not my feet be moved: say also, "Let Him that keeps you not sleep," and your foot shall not be moved.

He wilt not suffer thy foot to be moved,.... This is either an address of the psalmist to his own soul; or to any other good man, his friend and acquaintance, assuring of stability, and of final perseverance in grace to glory.

He will not suffer thy foot to be moved. Though the paths of life are dangerous and difficult, yet we shall stand fast, for Jehovah will not permit our feet to slide; and if he will not suffer it we shall not suffer it. If our foot will be thus kept we may be sure that our head and heart will be preserved also. In the original the words express a wish or prayer, —"May he not suffer thy foot to be moved." Promised preservation should be the subject of perpetual prayer; and we may pray believing; for those who have God for their keeper shall be safe from all the perils of the way. Among the hills and ravines of Palestine the literal keeping of tim feet is a great mercy; but in the slippery ways of a tried and afflicted life, the boon of upholding is of priceless value, for a single false step might cause us a fall fraught with awful danger. To stand erect and pursue the even tenor of our way is a blessing which only God can give, which is worthy of the divine hand, and worthy also of perennial gratitude. Our feet shall move in progress, but they shall not be moved to their overthrow. He that keepeth thee will not slumber, —or "thy keeper shall not slumber". We should not stand a moment if our keeper were to sleep; we need him by day and by night; not a single step can be safely taken except under his guardian eye. This is a choice stanza in a pilgrim song. God is the convoy and body guard of his saints. When dangers are awake around us we are safe, for our Preserver is awake also, and will not permit us to be taken unawares. No fatigue or exhaustion can cast our God into sleep; his watchful eyes are never closed.

He will not suffer thy foot to be moved - The foundation, God’s infinite power and goodness, on which thou standest, cannot be moved; and whilst thou standest on this basis, thy foot cannot be moved.

He will not suffer thy foot to be moved - He will enable you to stand firm. You are safe in his protection. Compare the notes at Psa 38:16. This, with the remainder of the psalm, seems to be of the nature of an answer to the anxious question in Psa 121:1 - an answer which the author of the psalm, in danger and trouble, makes to his own soul, imparting confidence to himself. He that keepeth thee will not slumber - He will be ever watchful and wakeful. Compare Isa 27:3. All creatures, as far as we know, sleep; God never sleeps. Compare Psa 139:11-12. His eyes are upon us by day, and in the darkness of the night - the night literally; and also the night of calamity, woe, and sorrow.