“In whom ye also trusted, after that ye heard the word of trueth, the Gospel of your saluation: in whom also after that yee beleeued, yee were sealed with that holy Spirit of promise,”
1611 King James Version (KJV)
1:13 In whom ye - Gentiles. Likewise believed, after ye had heard the gospel - Which God made the means of your salvation; in whom after ye had believed - Probably some time after their first believing. Ye were sealed by that Holy Spirit of promise - Holy both in his nature and in his operations, and promised to all the children of God. The sealing seems to imply, A full impression of the image of God on their souls. A full assurance of receiving all the promises, whether relating to time or eternity.
Eph 1:13 In whom ye also [trusted]. The "we" of Eph 1:12 refers to Jewish believers; the "ye", to Gentile believers, like most of the Ephesians, who also trusted, after that they "heard the word of truth". They not only hoped, but believed. That is, they became believers, by trusting obedience; then they were sealed with that Holy Spirit of promise. After they were converted, the Holy Spirit was bestowed upon them. It was a "promise" (Ac 1:4). The seal was attached to a letter or legal document to authenticate it to the world. The Holy Spirit, the Spirit of adoption, was God's authentication to the world that the converts to Christ were accepted as his children. The presence of the new Spirit was shown by a new life exhibiting the fruits of the Spirit (Ga 5:22).