John Calvin Commentary Psalms 145:9

"Jehovah is good to all; And his tender mercies are over all his works." — Psalms 145:9 (ASV)

Jehovah is good to all, and so forth. The truth here stated is of wider application than the former, for David's declaration is that God not only forgives sin with fatherly indulgence and clemency, but is also good to all without discrimination, as he makes his sun rise upon the good and upon the wicked (Matthew 5:45). Forgiveness of sin is a treasure from which the wicked are excluded, but their sin and depravity do not prevent God from showering down his goodness upon them, which they appropriate without being at all aware of it. Meanwhile believers, and they only, know what it is to enjoy a reconciled God, as it is said elsewhere:

Come to him, and be enlightened, and your faces shall not be ashamed; taste and see that the Lord is good.
(Psalms 34:5, 8).

When it is added that the mercy of God extends to all his works, this ought not to be considered contrary to reason, or obscure. Our sins having involved the whole world in the curse of God, there is everywhere an opportunity for the exercise of God’s mercy, even in helping the brute creation.