Charles H. Spurgeon on Psalms 107:12

Therefore he brought down their heart with labour. In eastern prisons men are frequently made to labour like beasts of the field. As they have no liberty, so they have no rest. This soon subdues the stoutest heart, and makes the proud boaster sing another tune. Trouble and hard toil are enough to tame a lion. God has methods of abating the loftiness of rebellious looks; the cell and the mill make even giants tremble. They fell down, and there was none to help. Stumbling on in the dark beneath their weary task, they at last fell prone upon the ground, but no one came to pity them or to lift them up. Their fall might be fatal for aught that any man cared about them; their misery was unseen, or, if observed, no one could interfere between them and their tyrant masters. In such a wretched plight the rebellious Israelite became more lowly in mind, and thought more tenderly of his God and of his offences against him. When a soul finds all its efforts at self salvation prove abortive, and feels that it is now utterly without strength, then the Lord is at work hiding pride from man and preparing the afflicted one to receive his mercy. The spiritual case which is here figuratively described is desperate, and therefore affords the finer field for the divine interposition; some of us remember well how brightly mercy shone in our prison, and what music the fetters made when they fell off from our hands. Nothing but the Lord's love could have delivered us; without it we must have utterly perished.