Charles H. Spurgeon on Psalms 123:2

Servants. "A Maiden". We know how shamefully servants were treated in ancient times, and what reproaches must be cast upon them, whilst yet they durst not move a finger to repel the outrage. Being therefore deprived of all means of defending themselves, the only thing which remained for them to do was, what is here stated, to crave the protection of their masters. The same explanation is equally applicable to the case of handmaids. Their condition was indeed shameful and degrading; but there is no reason why we should be ashamed of, or offended at, being compared to slaves, provided God is our defender, and takes our lives under his guardianship; God, I say, who purposely disarms us and strips us of all worldly aid, that we may learn to rely upon his grace, and to be contented with it alone. It having been anciently a capital crime for bondmen to carry a sword or any other weapon about them, and as they were exposed to injuries of every description, their masters were wont to defend them with so much the more spirit, when anyone causelessly did them violence. Nor can it be doubted that God, when he sees us placing an exclusive dependence upon his protection, and renouncing all confidence ib our resources, will, as our defender, encounter and shield us from all the molestation nthat shall be offered to us. —John Calvin

Observe the covenant name, "Jehovah our God": it is sweet to wait upon a covenant God. Because of that covenant he will show mercy to us; but we may have to wait for it. "Until that he have mercy upon us:". God hath his time and season, and we must wait until it cometh. For the trial of our faith our blessed Lord may for awhile delay, but in the end the vision will be fulfilled. Mercy is that which we need, that which we look for, that which our Lord will manifest to us. Even those who look to the Lord, with that holy look which is here described, still need mercy, and as they cannot claim it by right they wait for it till sovereign grace chooses to vouchsafe it. Blessed are those servants whom their Master shall find so doing. Waiting upon the Lord is a posture suitable both for earth and heaven: it is, indeed, in every place the right and fitting condition for a servant of the Lord. Nor may we leave the posture so long as we are by grace dwellers in the realm of mercy. It is a great mercy to be enabled to wait for mercy, so much the more spirit, when anyone causelessly did them violence. Nor can it be doubted that God, when he sees us placing an exclusive dependence upon his protection, and renouncing all confidence in our own resources, will, as our defender, encounter and shield us from all the molestation that shall be offered to us. —John Calvin.