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9. For with thee is the fountain of life The Psalmist here confirms the doctrine of the preceding verse, the knowledge of which is so profitable that no words can adequately express it. As the ungodly profane even the best of God’s gifts by their wicked abuse of them, unless we observe the distinction which I have stated, it were better for us to perish a hundred times of hunger, than to be fed abundantly by the goodness of God. The ungodly do not acknowledge that it is in God they live, move, and have their being, but rather imagine that they are sustained by their own power; and, accordingly, David, on the contrary, here affirms from the experience of the godly, and as it were in their name, that the fountain of life is in God. By this he means, that there is not a drop of life to be found without him, or which flows not from his grace. The metaphor of light, in the last clause of the verse, is tacitly most emphatic, denoting that men are altogether destitute of light, except in so far as the Lord shines upon them. If this is true of the light; of this life, how shall we be able to behold the light of the heavenly world, unless the Spirit of God enlighten us? for we must maintain that the measure of understanding with which men are by nature endued is such, that

“the light shineth in darkness,
but the darkness comprehendeth it not,” (John 1:5;)

and that men are enlightened only by a supernatural gift. But it is the godly alone who perceive that they derive their light from God, and that, without it, they would continue, as it were, buried and smothered in darkness.

10. Prolong thy mercy to them that know thee. David now sets himself to pray. And, first, he asks in general, that God would continue his mercy to all the godly, and then he pleads particularly in his own behalf, imploring the help of God against his enemies. Those who affirm that God is here said to prolong or extend his mercy because it is exalted above the heavens, indulge in a style of speaking too puerile. When David spake of it in such terms in a preceding verse, his intention was not, as I have already said, to represent the mercy of God as shut up in heaven, but simply to declare that it was diffused throughout the world; and here what he desires is just this, that God would continue to manifest, even to the end, his mercy towards his people. With the mercy of God he connects his righteousness, combining them as cause and effect. We have already said in another place, that the righteousness of God is manifested in his undertaking the defense of his own people, vindicating their innocence, avenging their wrongs, restraining their enemies, and in proving himself faithful in the preservation of their welfare and happiness against all who assail them. Now, since all this is done for them freely by God, David, with good reason, makes mention particularly of his goodness, and places it first in order, that we may learn to depend entirely upon his favor. We ought also to observe the epithets by which he describes true believers; first, he says, that they know God; and, secondly, that they are upright in heart. We learn from this that true godliness springs from the knowledge of God, and again, that the light of faith must necessarily dispose us to uprightness of heart. At the same time, we ought always to bear in mind, that we only know God aright when we render to him the honor to which he is entitled; that is, when we place entire confidence in him.