Psalms 19:2

Day unto day uttereth speech, and night unto night sheweth knowledge.

Ver. 2. Day unto day uttereth speech] Some read it, one day succeeding another uttereth (or welleth out, as a fountain, continually, and plentifully) speech, yet without sound, Sicut fons scaturiens (R. Menahem); by a dumb kind of eloquence, eructant; by a continual revolution and succession of days men are instructed concerning the power and providence of God, as also concerning his truth and faithfulness; for if God had hitherto kept promise with nights and days, that one shall succeed the other, will he not much more keep promise with his people? Jeremiah 33:20; Jeremiah 33:25 .

And night unto night showeth knowledge] Days and nights by their perpetual course and order, Dei potentiam et sapientiam concelebrant; there being no less necessity of the night in its kind than of the day. The knowledge it showeth us is, that man in himself is weak, and cannot long hold out hard labour; that he is permitted to sleep a while, and take his rest; that he must abridge himself of some part of his rest to commune with his own heart on his bed, and be still; that if he bestir not himself, and do up his work quickly, the night of death cometh, when no man can work, &c.