I. In the Bible usually the Word of the Lord means not only the message which God sends, but Him by whom God sends it. The Word of God, Word of the Lord, is spoken of again and again not as a thing, but as a Person, a living, rational Being, who comes to men, and speaks to them, and teaches them, sometimes seemingly by actual word of mouth, sometimes, again, by putting thoughts into their minds and words into their mouths.
II. The Psalmist wants to know his way through this world and his duty in this mortal life. Therefore he must learn the laws and rules of this world. And he has the sense to see that no one can teach him the rules of the world but the Ruler of the world and the Maker of the world. Then comes the terrible question, Are there any rules at all in the world? Does the Lord manage the world by rules and laws? Or does He let things go by chance and accident, and take no care about them? To that the Psalmist answers firmly, because be is inspired by the Spirit of God, "O Lord, Thy Word endureth " is settled "forever in heaven. In Thee is no carelessness, neglect, slothfulness, nor caprice." The world is full of settled and enduring rules and laws, and God keeps to them.
III. Jesus Christ is the Word of God, who speaks to men God's words, because He speaks not His own words, but His Father's, and does not His own will, but His Father's, who sends Him. He speaks to us and to all men in many ways, and to each according to his needs. He is the Word who endures for ever in heaven; and though heaven and earth may pass away, His words cannot pass away.
C. Kingsley, Westminster Sermons,p. 151 (see also Town and Country Sermons,p. 403).
References: Psalms 119:94. C. Kingsley, Christian World Pulpit,vol. iv., p. 346, and Westminster Sermons,p. 165.