God is Good, Originally and of Himself

He is originally good, good of Himself, which nothing else is; for all creatures are good only by participation and communication from God. He is essentially good; not only good, but goodness itself: the creature’s good is a superadded quality, in God it is His essence. He is infinitely good; the creature’s good is but a drop, but in God there is an infinite ocean or gathering together of good. He is eternally and immutably good, for He cannot be less good than He is; as there can be no addition made to Him, so no subtraction from Him.

—Thomas Manton
Quoted by A. W. Pink, The Nature of God, 69.