You have carnal men in presumption, which leads them to destruction; they sever things in Christ. They will take benefit by Christ, but they care not for his likeness; they will have him as priest, but they respect him not as a king. Now all that are Christ's have the stamp of the Spirit upon them. There are desires wrought in them by the Spirit of God to that purpose; and a Spirit of sanctification that makes them every way like Christ in their proportion.
And that is an evidence of the sealing of such a soul, because the soul of itself hath no such impression: for the soul of itself is a barren wilderness, a stone that is cold and incapable of impression. When, therefore, the soul can command nature, being stiff, and hard, and dead, we see an impression of a higher nature, a man may know that undoubtedly the Spirit of God hath been in his soul; for we see a loving spirit, an humble spirit, a gracious, a believing, a broken spirit, an obedient spirit to every commandment of God, the soul can yield itself wholly to the will of God in all things. Certainly, I say, the Spirit of God hath been here, for these things grow not in a natural soul. A stone, you know, is cold by nature, the sun hath shined upon this stone. Our hearts are very cold by nature; undoubtedly, when they are warmed with the love of God, that they are made pliable to duties, the Sun of righteousness, Christ, hath shined on this cold heart. God's Spirit can work on marble, can work on brass, as Jeremiah saith, Jer. vi. 28. It was the commendations of one of the fathers that he could work on brass. God can work on our souls, which are as brass, and make an impression of grace there; and therefore when a man sees an impression upon such hard metal, certainly he may know that the finger of God's Spirit hath been there. So that the work of sanctification is an undoubted seal of the Spirit of God." Richard Sibbes "Commentary On 2 Corinthians 1, ver. 22" pg. 453,454 Volume 3 THE WORKS OF RICHARD SIBBES