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.

For with thee is the fountain of life - The fountain or source from which all life flows. All living beings derive their origin from thee, as streams flow from fountains; all that is properly "called" life proceeds from thee; everything which makes life real life - which makes it desirable or happy - has its origin in thee. The psalmist evidently meant here to include more than mere "life" considered as animated existence. He recalls what he had referred to in the previous verses - the various blessings which proceeded from the mercy and loving-kindness of God, and which were attendant on his worship; and he here says that all this - all that makes man happy - all that can properly be regarded as "life" - proceeds from God. Life literally, in man and in all animated beings; life spiritually; life here, and life hereafter - all is to be traced to God.
In thy light shall we see light - As thou art the Source of light, and all light proceeds from thee, so we shall be enabled to see light, or to see what is true, only as we see it in thee. By looking to thee; by meditating on thy character; by a right understanding of thyself; by being encompassed with the light which encompasses thee, we shall see light on all those great questions which perplex us, and which it is so desirable that we should understand. It is not by looking at ourselves; it is not by any human teaching; it is not by searching for information "away from thee," that we can hope to have the questions which perplex us solved; it is only by coming to thyself, and looking directly to thee. There is no other source of real light and truth but God; and in the contemplation of himself, and of the light which encompasses him, and in that alone, can we hope to comprehend the great subjects on which we pant so much to be informed. All away from God is dark; all near him is light. If, therefore, we desire light on the subjects which pertain to our salvation, it must be sought by a direct and near approach to him; and the more we can lose ourselves in the splendors of his throne, the more we shall understand of truth. Compare 1-John 1:5; Revelation 21:23; Revelation 22:5; 1-Peter 2:9.

For with thee is the fountain of life - This, in Scripture phrase, may signify a spring of water; for such was called among the Jews living water, to distinguish it from ponds, tanks, and reservoirs, that were supplied by water either received from the clouds, or conducted into them by pipes and streams from other quarters. But there seems to be a higher allusion in the sacred text. כי עמך מקור חיים ki immecha mekor chaiyim, "For with thee is the vein of lives." Does not this allude to the great aorta, which, receiving the blood from the heart, distributes it by the arteries to every part of the human body, whence it is conducted back to the heart by means of the veins. As the heart, by means of the great aorta, distributes the blood to the remotest parts of the body; so, God, by Christ Jesus, conveys the life-giving streams of his providential goodness to all the worlds and beings he has created, and the influences of his grace and mercy to every soul that has sinned. All spiritual and temporal good comes from Him, the Father, through Him, the Son, to every part of the creation of God.
In thy light shall we see light - No man can illuminate his own soul; all understanding must come from above. Here the metaphor is changed, and God is compared to the sun in the firmament of heaven, that gives light to all the planets and their inhabitants. "God said, Let there be light; and there was light; "by that light the eye of man was enabled to behold the various works of God, and the beauties of creation: so, when God speaks light into the dark heart of man, he not only beholds his own deformity and need of the salvation of God, but he beholds the "light of the glory of God in the face of Jesus Christ;" "God, in Christ, reconciling the world to himself." "In thy light shall we see light." This is literally true, both in a spiritual and philosophical sense.

For with thee is the fountain of life,.... Or "lives" (f): God himself is the fountain of living waters; this is a reason proving the happiness of those that trust in the Lord, and that they shall enjoy the above things; because with God the object of their trust is the fountain of life; not only of natural life, from whom they have it, and by whom it is supported, but of spiritual life, being quickened by him when dead in sin, by virtue of which they live by faith on Christ, and also of eternal life; and the phrase denotes, that life is originally in God as in its fountain, and that both the fulness of it is with him, and the freeness of it in the communication of it to others, as well as its continuance and duration;
in thy light shall we see light; God is light itself, the Father of lights, and the former of it in every sense; in the light of his countenance, and the discoveries of his love, they that trust in him see light, or enjoy comfort; and in the light of his Son Jesus Christ, the sun of righteousness and light of the world, they see the face of God, and enjoy his favour, and behold the glory and excellency of Christ himself; and in the light of the divine Spirit, who is a spirit of wisdom and revelation, they see their sins exceeding sinful, their righteousness as nothing, and a preciousness in the blood, righteousness, and sacrifice of Christ; and in the light of the divine word they see the truths of the Gospel in their native simplicity and excellency, and the duties of religion to be performed by them; and in the light of faith, which is the gift of God, they have at least a glimpse of the unseen glories of the other world; and when the beatific vision shall take place, they shall see no more darkly through a glass, but face to face, even God himself, as he is in Christ.
(f) "vena vitarum", Montanus.

Light is an emblem of all blessings, given of God as a means to gain more.

Life - It is in God as in a fountain, and from him is derived to us. But - Of that glorious and blessed, and endless life, which alone is worthy of the name. Light - In the light of thy glorious presence, which shall be fully manifested, when we see thee face to face. Light - Joy and comfort, and happiness: the word light is elegantly repeated in another signification; in the former clause it is light discovering, in this light, discovered or enjoyed.