13 In whom ye also trusted, after that ye heard the word of truth, the gospel of your salvation: in whom also after that ye believed, ye were sealed with that holy Spirit of promise,
English Standard Version
13 In him you also, when you heard the word of truth, the gospel of your salvation, and believed in him, were sealed with the promised Holy Spirit,
13 It's in Christ that you, once you heard the truth and believed it (this Message of your salvation), found yourselves home free - signed, sealed, and delivered by the Holy Spirit.
New King James Version
13 In Him you also trusted, after you heard the word of truth, the gospel of your salvation; in whom also, having believed, you were sealed with the Holy Spirit of promise,
New Living Translation
13 And now you Gentiles have also heard the truth, the Good News that God saves you. And when you believed in Christ, he identified you as his own by giving you the Holy Spirit, whom he promised long ago.
Blessings were made known to believers, by the Lord's showing to them the mystery of his sovereign will, and the method of redemption and salvation. But these must have been for ever hidden from us, if God had not made them known by his written word, preached gospel, and Spirit of truth. Christ united the two differing parties, God and man, in his own person, and satisfied for that wrong which caused the separation. He wrought, by his Spirit, those graces of faith and love, whereby we are made one with God, and among ourselves. He dispenses all his blessings, according to his good pleasure. His Divine teaching led whom he pleased to see the glory of those truths, which others were left to blaspheme. What a gracious promise that is, which secures the gift of the Holy Ghost to those who ask him! The sanctifying and comforting influences of the Holy Spirit seal believers as the children of God, and heirs of heaven. These are the first-fruits of holy happiness. For this we were made, and for this we were redeemed; this is the great design of God in all that he has done for us; let all be ascribed unto the praise of his glory.