In whom you also trusted, after that you heard the word of truth, the gospel of your salvation: in whom also after that you believed…
(3) were sealed.Faith is our seal. Assurance is God's seal. God honours our sealing to His truth by His sealing by His Spirit. There must be the bargain before the earnest.
Parallel VersesKJV: 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,