Charles H. Spurgeon on Psalms 119:174

I have longed for thy salvation, O LORD. For a present salvation from the guilt and power of sin, and for future salvation, in the full and everlasting enjoyment of God in heaven. David had the happiness to be a partaker, both of pardoning mercy and of sanctifying grace; yet still he longed for more of this salvation, that is, for a more assured faith of pardoning mercy, and larger measures of sanctifying grace. A gracious soul is insatiable; the more it hath received, the more it desires to receive. Enjoyment, instead of surfeiting, sharpens the appetite. Nay, so sweet is the relishing of spiritual things, that every renewed taste of them quenches the thirst for other things.

Thy law is my delight. Here David chooses the term "law" for denoting the whole revelation of God's will, to remind us of the inseparable connexion between privilege and duty, faith and obedience, holiness and comfort; and to teach us that we ought to be thankful to God for the direction he hath given us in the road to heaven, no less than for the promises by which we are assured of the possession of it. Robert Walker, 1716 1783.