Though these statements below are not from the framers of the Second London Confession of Faith, they are from theologians who were their contemporaries and predecessors. All of them agreed that, "quicquid est in Deo, Deus est." Whatsoever is in God is God. Enjoy!
"God is the most simple being; for that which is first in nature, having nothing beyond it, cannot by any means be thought to be compounded..now God being infinitely simple, hath nothing in himself which is not himself." Charnock Existence & Attributes of God, 210
"God is perfect in His Being and His perfection cannot be improved upon in any way. All that may be discerned in God is God Himself. His goodness, wisdom, and omnipotence is the good, only wise, and omnipotent God Himself." Wilhelmus á Brakel TCRS, vol. 1
“The attributes of God, which alone seem to be distinct things in the essence of God, are all of them essentially the same with one another, and every one the same with the essence of God itself.” John Owen Vindiciae Evangelicae, 24
"The essential attributes of God are not parts or qualities of the Divine Essence, nor Accidents in the Essence, nor a subject: But the very whole and entire Essence of God." Bayly Practice of Piety, 32.
"The Attributes, as was said before, are not distinguished in God, that is, from the divine Essence..For every and all the Attributes are the divine Essence itself; according to that received proposition, whatsoever is in God, is God." John Norton TOE, 4
"Simplicity itself which is that Attribute by which God is one most pure and entire essence, one most simple being without all composition..but he is every way most simple, nothing in him, but what is God, what is himself." John Preston, Life Eternal, Ser. 12
"Simplicity is a property of God..being all essence; whatsoever is in God, is God..God is absolutely simple, he is but one thing..but himself, his essence, and attributes are all one thing..by us diversly considered and understood." Edward Leigh A Treatise of Divinity, 26-7