"The nature of sealing consists in the imparting of the image or character of the seal to the thing sealed. This is to seal a thing-to stamp the character of the seal on it. In this sense, the effectual communication of the image of God unto us should be our sealing. The Spirit in believers, really communicating the image of God, in righteousness and true holiness, unto the soul, seals us. To have this stamp of the Holy Spirit, so as to be an evidence unto the soul that it is accepted with God, is to be sealed by the Spirit."
~John Owen
God has put His seal on us and given us His Spirit in our hearts as a guarantee.
2 Corinthians 1:22
