Psalms 38:9

9O Lord! thou knowest all my desire. He adds this, not so much in respect of God, as to strengthen himself in the hope of obtaining some alleviation of his trouble, and thus to animate himself to persevering prayer. It may be explained in a twofold sense, either as denoting his confident assurance that his prayers and groanings were heard by the Lord, or a simple declaration that he had poured out before God all his cares and troubles; but the meaning is substantially the same: for as long as men entertain any doubt whether their groanings have come up before God, they are kept in constant disquietude and dread, which so fetters and holds captive their minds, that they cannot elevate their souls to God. On the contrary, a firm persuasion that our groanings do not vanish away in their ascent to God, but that he graciously hears them, and familiarly listens to them, produces promptitude and alacrity in engaging in prayer. It might, therefore, prove no small ground of encouragement to David, that he approached God, not with a doubting and trembling heart, but strengthened and encouraged by the assurance of which we have spoken, and of which he himself speaks in another place, that his tears were laid up in God’s bottle, (Psalms 56:8.) In order that we may obtain access to God, we must believe that he is “a rewarder of them that diligently seek him,” as the apostle states in his Epistle to the Hebrews, (Hebrews 11:6.) But I rather approve of the other interpretation, That David here declares that he had disburdened all his sorrows into the bosom of God. The reason why the greater part of men derive no profit from complaining grievously in their sorrow is, that they direct not their prayers and sighs to God. David, then, in order to encourage himself in the assured conviction that God will be his deliverer, says, that he had always been a witness of his sorrows, and was well acquainted with them, because he had neither indulged in a fretful spirit, nor poured out into the air his complaints and howlings as the unbelieving are wont to do, but had spread out before God himself all the desires of his heart.