Day unto day - One day to another; or, each successive day. The day that is passing away proclaims the lesson which it had to convey from the movements of the heavens, about God; and thus the knowledge of God is accumulating as the time moves on. Each day has its own lesson in regard to the wisdom, the power, and the goodness of God, and that lesson is conveyed from one day to another. There is a perpetual testimony thus given to the wisdom and power of the Great Creator.

Uttereth speech - The word here rendered uttereth means properly to pour forth; to pour forth copiously as a fountain. Compare Proverbs 18:4; Proverbs 1:23; Proverbs 15:2, Proverbs 15:28. Hence, the word means to utter; to declare. The word "speech" means properly "a word;" and then, "a lesson;" or "that which speech conveys." The idea is, that the successive days thus impart instruction, or convey lessons about God. The day does this by the returning light, and by the steady and sublime movement of the sun in the heavens, and by all the disclosures which are made by the light of the sun in his journeyings.

And night unto night showeth knowledge - Knowledge respecting God. Each successive night does this. It is done by the stars in their courses; in their order; their numbers; their ranks; their changes of position; their rising and their setting. There are as many lessons conveyed to man about the greatness and majesty of God by the silent movements of each night as there are by the light of the successive days - just as there may be as many lessons conveyed to the soul about God in the dark night of affliction and adversity, as there are when the sun of prosperity shines upon us.

Day unto day uttereth speech - Each day is represented as teaching another relative to some new excellence discovered in these manifold works of God. The nights also, by the same figure, are represented as giving information to each other of the increase of knowledge already gained.

"The labors of these our instructers know no intermission; but they continue incessantly to lecture us in the science of Divine wisdom. There is one glory of the sun, which shines forth by day; and there are other glories of the moon and of the stars, which become visible by night. And because day and night interchangeably divide the world between them, they are therefore represented as transmitting, in succession, each to other, the task enjoined them, like the two parts of a choir, chanting forth alternately the praises ot God." - Bisbop Horne.

Day untoday uttereth speech,.... This, with the following clause,

and night untonight showeth knowledge, some understand of the constant and continued succession of day and night; which declares the glory of God, and shows him to be possessed of infinite knowledge and wisdom; and which brings a new accession of knowledge to men; others, of the continual declaration of the glory of God, and of the knowledge of him made by the heavens and the firmament, the ordinances of which always continue; the sun for a light by day, and the moon and stars for a light by night; and so night and day constantly and successively proclaim the glory and wisdom of God: but rather this is to be understood of the constancy of the Gospel ministry, and the continuance of the evangelic revelation. The apostles of Christ persevered in their work, and laboured in the word and doctrine night and day: they were in it at all seasons; yea, were instant in season and out of season; and though they are dead, the Gospel continues, and will do as long as day and night remain: and these, like overflowing fountains, sent forth in great abundance, as the word (x) rendered "uttereth" signifies, the streams of divine light and knowledge; they were full of matter, and their tongues were as the pen of a ready writer; they diffused the savour of the knowledge of Christ, in great plenty, in every place where they came. These words express the continuance of the Gospel revelation, as the next do the extent of it.

(x) "eructat", Musculus, Munster, Vatablus, Junius & Tremellius, Piscator; so Ainsworth; "scaturit", Muis; "scaturiendo effundit", Cocceius; "copiose ac constanter instar foecundae cujusdam scaturiginis protrudit, emittit", Gejerus; so Michaelis.

{b} Day unto day uttereth speech, and night unto night sheweth knowledge.

(b) The continual success of the day and night is sufficient to declare God's power and goodness.

19:2 Day - Every day and night repeats these demonstrations of God's glory. Uttereth - Or, poureth forth, constantly and abundantly, as a fountain doth water; So this Hebrew word signifies. Knowledge - Gives us a clear knowledge or discovery of God their author.

2. uttereth-pours forth as a stream; a perpetual testimony.

19:1-6 The heavens so declare the glory of God, and proclaim his wisdom, power, and goodness, that all ungodly men are left without excuse. They speak themselves to be works of God's hands; for they must have a Creator who is eternal, infinitely wise, powerful, and good. The counter-changing of day and night is a great proof of the power of God, and calls us to observe, that, as in the kingdom of nature, so in that of providence, he forms the light, and creates the darkness, Isa 45:7, and sets the one against the other. The sun in the firmament is an emblem of the Sun of righteousness, the Bridegroom of the church, and the Light of the world, diffusing Divine light and salvation by his gospel to the nations of the earth. He delights to bless his church, which he has espoused to himself; and his course will be unwearied as that of the sun, till the whole earth is filled with his light and salvation. Let us pray for the time when he shall enlighten, cheer, and make fruitful every nation on earth, with the blessed salvation. They have no speech or language, so some read it, and yet their voice is heard. All people may hear these preachers speak in their own tongue the wonderful works of God. Let us give God the glory of all the comfort and benefit we have by the lights of heaven, still looking above and beyond them to the Sun of righteousness.