The soul, viewing the infallible truth and faithfulness of God, refuses to rely upon human promises. They neither can cause him to rejoice nor can human threatenings terrify him, for he is aware of human mutability. However, he knows the Lord to be a God of truth who keepeth truth forever. He knows the promises and believes them, being so convinced of their certainty as if they were already fulfilled. He therefore rests in them and has a joyful hope in them.Wilhelmus À Brakel, The Christian’s Reasonable Service
We should banish from our minds forever the common but erroneous notion that justice and judgment characterize the God of Israel, while mercy and grace belong to the Lord of the Church. Actually there is in principle no difference between the Old Testament and the New. In the New Testament Scriptures there is a fuller development of redemptive truth, but one God speaks in both dispensations, and what He speaks agrees with what He is. Wherever and whenever God appears to men, He acts like Himself. Whether in the Garden of Eden or the Garden of Gethsemane, God is merciful as well as just. He has always dealt in mercy with mankind and will always deal in justice when His mercy is despised. Thus He did in antediluvian times; thus when Christ walked among men; thus He is doing today and will continue always to do for no other reason than that He is God.
—A. W. Tozer