The knowledge of Jesus Christ is the very marrow and kernel of all the scriptures; the scope and centre of all divine revelations: both Testaments meet in Christ. The ceremonial law is full of Christ, and all the gospel is full of Christ: the blessed lines of both Testaments meet in him; and how they both harmonise, and sweetly concentre in Jesus Christ, is the chief scope of that excellent epistle to the Hebrews, to discover; for we may call that epistle the sweet harmony of both Testaments. This argues the unspeakable excellency of this doctrine, the knowledge whereof must needs therefore be a key to unlock the greatest part of the sacred scriptures. For it is in the understanding of scripture, much as it is in the knowledge men have in logic and philosophy: if a scholar once come to understand the bottom-principle, upon which, as upon its hinge, the controversy turns the true knowledge of that principle shall carry him through the whole controversy, and furnish him with a solution to every argument. Even so the right knowledge of Jesus Christ, like a clue, leads you through the whole labyrinth of the scriptures.