First. The word mystery is used in an evil sense. ‘The mystery of iniquity doth already work,’ II Thes. 2:7; whereby is meant the secret rising antichristian dominion, whereof some foundations were laid even in the apostle’s days. Error is but a day younger than truth. When the gospel began first to be preached by Christ and his apostles, error presently put forth her hand to take it by the heel and supplant it. The whole system of antichristianism is a mystery of policy and impiety. Mystery is written upon the whore of Babylon’s forehead, Rev. 17:2. And Causabon tells us the same word was written upon the pope’s mitre; if so, it is well he would own his name. ‘My soul, enter not thou into their secrets.’
Second. In a good sense. Sometimes for some particular branch of evangelical truth. Thus the rejection of the Jews and calling of the Gentiles is called a ‘mystery,’ Rom. 11:25; the wonderful change of those that shall be upon the earth at the end of the world, I Cor. 15:51; the incarnation, resurrection, and ascension of Christ, I Tim. 3:16; with others. Sometimes it is used for the whole body of the gospel; as to the doctrine of it, called a ‘mystery of faith,’ I Tim. 3:9; as to the purity of its precepts and rules for a holy life, a ‘mystery of godliness;’ as to the author, subject, and end of it, called ‘the mystery of Christ,’ Eph. 3:4—it was revealed by him, treats of him, and leads souls to him; and lastly, in regard of the blessed reward it promiseth to all that sincerely embrace it, called ‘the mystery of the kingdom of God,’ Mark 4:11. This gospel is the glorious mystery we are now to speak of; and we will show in what respect it is a mystery, or why so called by the Spirit of God.
Why or in what respects the gospel is a mystery. First. Because it is known only by divine revelation. Such a secret it is that the wit of man could never have found out. There are many secrets in nature, which, with much plodding and study, have at last been discovered, as the medicinal virtue of plants and the like; but the gospel is a secret, and contains in it such mysteries as were omni ingenio altiora—beyond the reach of all genius, as Calvin saith. What man or angel could have thought of such a way for reconciling God and man as in the gospel is laid out? How impossible was it for them to have conjectured what purposes of love were locked up in the heart of God towards fallen man, till himself did open the cabinet of his own counsel? Or had God given them some hint of a purpose he had for man’s recovery, could they ever have so much as thought of such a way as the gospel brings to light? Surely as none but God could lay the plot, so none but himself could make it known. The gospel therefore is called ‘a revelation of the mystery, which was kept secret since the world began,’ Rom. 16:25.
Second. Because the gospel when revealed, its truths exceed the grasp of human understanding. They are the eye of our reason as the sun is to the eye of our body, such a nimium excellens—exceeding excellency, as dazzles and overpowers the most piercing apprehension. They disdain to be discussed and tried by human reason. That there are three subsistences in the Godhead, and but one divine essence, we believe, because there revealed. But he that shall fly too near this light, as thinking to comprehend this mysterious truth in his narrow reason, will soon find himself lost in his bold enterprise. God and man, united in Christ’s person, is undeniably demonstrable from the gospel. But, alas! the cordage of our understanding is too short to fathom this great deep. ‘Without controversy,’ saith the apostle, ‘great is the mystery of godliness: God was manifest in the flesh,’ I Tim. 3:16. It is a truth without controversy, Òµ@8@(@LµX<TH—it is confessed of all, yet such a mystery as is not fordable by our short-legged understanding. That there is no name but the name of Jesus by which we can be saved is the grand notion of the gospel; but how many mysteries are wrapped up in this one truth? Who that should have seen the babe Jesus when he lay in the manger, and afterward meanly bred under a carpenter, and at last executed for a malefactor, could have imagined, as one saith, that upon such weak hinges should move such a glorious design for man’s salvation? But who dares think it unreasonable to believe that upon God’s report to be true, which we cannot make out by our own understanding? Some things we apprehend by reason that cannot be known by sense—as that the sun is bigger than the earth; some things by sense, which cannot be found out by reason. That the lodestone attracts iron, and not gold, our eye beholds; but why it should, there our reason is dunced and posed. Now if in nature we question not the truth of these, though sense be at a loss in one and reason in the other, shall we in religion doubt of that to be true which drops from God’s own mouth and pen, because it exceeds our weak understanding? Wouldst thou see a reason, saith Augustine, for all that God saith? look into thy own understanding, and thou wilt find a reason why thou seest not a reason.