Day unto day uttereth speech, and night unto night
sheweth knowledge. (Psalm 19:2)
If, indeed, we were as attentive as we ought to be, even one
day would suffice to bear testimony to us of the glory of God, and even one
night would be sufficient to perform to us the same office. But when we see the
sun and the moon performing their daily revolutions,—the sun by day appearing
over our heads, and the moon succeeding in its turns—the sun ascending by
degrees, while at the same time he approaches nearer us,—and afterwards bending
his course so as to depart from us by little and little;—and when we see that
by this means the length of the days and nights is regulated, and that the
variation of their length is arranged according to a law so uniform, as
invariably to recur at the same points of time in every successive year, we
have in this a much brighter testimony to the glory of God.
David, therefore, with the highest reason, declares, that
although God should not speak a single word to men, yet the orderly and useful
succession of days and nights eloquently proclaims the glory of God, and that
there is now left to men no pretext for ignorance; for since the days and
nights perform towards us so well and so carefully the office of teachers, we
may acquire, if we are duly attentive, a sufficient amount of knowledge under
their tuition. (Commentaries)