John Chrysostom
"But we preach the Wisdom of God in a mystery." What mystery? Christ said: "What you hear in the ear, preach on the housetops" (Mt 10:27). Why then does Paul call it a mystery? Because neither angel, nor archangel, nor any other created power knew it before it was revealed. Therefore the Apostle says: "That now the manifold Wisdom of God might be made known by the Church to the principalities and powers in the heavenly places" (Eph 3:10).
God so honored us that even they heard it together with us. In relation to friends, we regard it as a sign of our friendship when we reveal a secret to no one before them. Let those attend who boast in preaching, indiscriminately offer the pearls of teaching to all, cast holy things to dogs and swine, and do so with excessive speculations.
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A mystery does not allow embellishments. It is proclaimed exactly as it is. It will no longer be a divine and uncorrupted mystery if you add something of your own to it.
It is also called a mystery because in it we contemplate not what we see, but see one thing and believe another. Such is the property of our mysteries. I look upon them one way, and the unbeliever another. I hear that Christ was crucified, and I marvel at His love for mankind. The unbeliever hears this and considers it weakness.
I hear that Christ became a servant, and I marvel at His providence. The unbeliever hears this and considers it dishonor. I hear that Christ died, and I am amazed at His might: how, after undergoing death, He was not held by it, but even destroyed death. The unbeliever hears this and ascribes it to His weakness.
Hearing of the Resurrection, he calls it a fable. But I, being assured by the very events, worship the divine economy of God. Hearing of baptism, he imagines only water. But I see not only the visible thing, but also the invisible cleansing of the soul accomplished by the Spirit.
He thinks that only my body has been washed. But I believe that the soul too has become pure and holy. I set before myself the tomb, the Resurrection, sanctification, justification, redemption, adoption, inheritance, the Kingdom of heaven, and the gift of the Spirit. For I look at the visible not with simple sight, but with spiritual eyes. When the body of Christ is spoken of, I understand what is said one way, and the unbeliever another.