C.H. Spurgeons's The Treasury of David
Verse 17. But the mercy of the LORD is from everlasting to everlasting upon them that fear him. Blessed but! How vast the contrast between the fading flower and the everlasting God! How wonderful that his mercy should link our frailty with his eternity, and make us everlasting too! From old eternity the Lord viewed his people as objects of mercy, and as such chose them to become partakers of his grace; the doctrine of eternal election is most delightful to those who have light to see it and love wherewith to accept it. It is a theme for deepest thought and highest joy. The "to everlasting" is equally precious. Jehovah changes not, he has mercy without end as well as without beginning. Never will those who fear him find that either their sins or their needs have exhausted the great deep of his grace. The main question is, "Do we fear him?" If we are lifting up to heaven the eye of filial fear, the gaze of paternal love is never removed from us, and it never will be, world without end.
And his righteousness unto children's children. Mercy to those with whom the Lord makes a covenant is guaranteed by righteousness; it is because he is just that he never revokes a promise, or fails to fulfil it. Our believing sons and their seed for ever will find the word of the Lord the same: to them will he display his grace and bless them even as he has blessed us. Let us sing, then, for posterity. The past commands our praise and the future invites it. For our descendants let us sing as well as pray. If Abraham rejoiced concerning his seed, so also may the godly, for "instead of the fathers shall be the children," and as the last Psalm told us in its concluding verse, "the children of thy servants shall continue, and their seed shall be established before thee."
EXPLANATORY NOTES AND QUAINT SAYINGS
Verse 17. But the mercy of the Lord is from everlasting to everlasting. No human benevolence is perpetually the same; but by expelfence we see that those who are kind today, may be changed into tyrants tomorrow. Examples of this we have in the life of Nero, and many other rulers. Therefore lest we should suspect the goodness of God to bear any similar character, it is said with inconceivable consolation, that it shall never cease, but is prepared for ever for all those who fear and serve God. Musculus.
Verse 17. From everlasting to everlasting. From everlasting, by predestination; to everlasting, by glorification: the one without beginning, the other without end. Bernard.