"O send out thy light." The Psalmist desired that light might be sent out, that is, that there might be a communication of it. The soul walking in darkness, and enabled under that darkness to pant and cry after light, is not satisfied with the conviction, however deep, that with God is light. The thirsty man is not satisfied with knowing that there is water in the well; nor the man who has lost his way in a mine, with knowing that there is light in the sun. One faint ray gleaming through a chink were worth to him a thousand suns, blazing, unseen by him, in the sky. And thus the benighted saint cannot rest in the bare knowledge that "God is light, and in him is no darkness at all," but his sigh and cry is that this light may be sent out of the fulness of the Godhead into his soul, so as to shed abroad an inward light in his heart, whereby he may see the truth of God; whereby he may see the glory of God in the face of Jesus Christ; whereby he may see his name written in the book of life, and clearly discern his interest in the "everlasting covenant, ordered in all things, and sure;" whereby he may see Jesus, and in seeing Jesus see his own eternal union with Jesus, and in seeing his own eternal union with Jesus may enjoy sweet communion with him, so as to feel his presence in his soul, and have his glory revealed, and manifested to his heart.
David wanted something more than light. He says, "O send out thy light and thy truth." What was "the truth" which he sought to know, and realise its inward power by its being sent out of the fulness of the Godhead? Doubtless, the very same truth that saints are crying to be sent out now; and this can be nothing less than "the truth as it is in Jesus;" the truth of his blood as atoning for sin, the truth of his righteousness as justifying us from all things from which we could not be justified by the law of Moses; the truth of personal and everlasting deliverance from all curse and condemnation, that truth whereby the soul is made free, according to those words, "Ye shall know the truth, and the truth shall make you free;" the truth whereby the affections are separated from the things of time and sense, and fixed on the realities of eternity; in a word, to know Jesus himself, by his own sweet revelation, for he is "the way, the truth, and the life," and that he may be himself enjoyed in our soul as the sum and substance of truth.