Charles H. Spurgeon on Psalms 119:173

Let thine hand help me. Give me practical succour. Do not entrust me to my friends or thy friends, but put thine own hand to the work. Thy hand has both skill and power, readiness and force: display all these qualities on my behalf. I am willing to do the utmost that I am able to do; but what I need is thine help, and this is so urgently required that if I have it not I shall sink. Do not refuse thy succour. Great as thy hand is, let it light on me, even me. The prayer reminds me of Peter walking on the sea and beginning to sink; he, too, cried, "Lord, help me, "and the hand of his Master was stretched out for his rescue.

For I have chosen, thy precepts. A good argument. A man may fitly ask help from God's hand when he has dedicated his own hand entirely to the obedience of the faith. "I have chosen thy precepts." His election was made, his mind was made up. In preference to all earthly rules and ways, in preference even to his own will, he had chosen to be obedient to the divine commands. Will not God help such a man in holy work and sacred service? Assuredly he will. If grace has given us the heart with which to will, it will also give us the hand with which to perform. Wherever, under the constraints of a divine call, we are engaged in any high and lofty enterprise, and feel it to be too much for our strength, we may always invoke the right hand of God in words like these.