4 But in order that she may do this, hear what she says, what she supplicates, what she prays for. Pray thou for what you hear; pray for it when you hear it; let these words be the voice of us all: “O send out Your Light and Your Truth. They have led me, and brought me on unto Your holy hill, and into Your Tabernacles”. For that very “Light” and “Truth” are indeed two in name; the reality expressed is but One. For what else is the “Light” of God, except the “Truth” of God?
Or what else is the “Truth” of God, except the “Light” of God? And the one Person of Christ is both of these. “I am the Light of the world: he that believes in Me, shall not walk in darkness.” “I am the Way, the Truth, and the Life.” He is Himself “the Light:” He is Himself “the Truth.” Let Him come then and rescue us, and “separate at once our cause from the ungodly nation; let Him deliver us from the deceitful and unjust man,” let him separate the wheat from the tares, for at the time of harvest He will Himself send His Angels, that they may “gather out of His kingdom all things that offend,” and cast them into flaming fire, while they gather together the grain into the garner.
He will send out His “Light,” and His “Truth;” for that they have already “brought us and led us to His holy hill, and into His Tabernacles.” We possess the “earnest;” we hope for the prize. “His holy Hill” is His holy Church. It is that mountain which, according to Daniel's vision, grew from a very small “stone,” till it crushed the kingdoms of the earth; and grew to such a size, that it “filled the face of the earth.” This is the “hill,” from which he tells us that his prayer was heard, who says, “I cried unto the Lord with my voice, and He heard me out of His holy hill.” Let no one of those that are without that mountain, hope to be heard unto eternal life.
For many are heard in their prayers for many things. Let them not congratulate themselves on being heard; the devils were heard in their prayer, that they might be sent into the swine. Let us desire to be heard unto eternal life, by reason of our longing, through which we say, “Send out Your Light and Your Truth.” That is a “Light” which requires the eye of the heart. For “Blessed” (He says) “are the pure in heart, for they shall see God.” We are now on His Hill, that is, in His Church, and in His Tabernacle.
The “tabernacle” is for persons sojourning; the house, for those dwelling in one community. The tabernacle is also for those who are both from home, and also in a state of warfare. When you hear of a tabernacle, form a notion of a war; guard against an enemy. But what shall the house be? “Blessed are they that dwell in Your house: they will be always praising You.”
Source: The Enarrations, or Expositions, on the Psalms (New Advent)