Day unto day uttereth speech, and night unto night sheweth knowledge.
Day unto day uttereth speech. The testimony of the heavenly luminaries is an unceasing one, and is transmitted by each one day and each one night to its successor continually. The speech of the day is the echo of the speech or testimony of the heavens. The Hebrew for "uttereth" х naaba` (H5042)] means to sputter forth, implying the rich fullness of the testimony of every day.
And night unto night showeth knowledge - i:e., the knowledge of God's glory.