Trust, hear, believe the gospel = SEALED till the day of redemption The believer IS sealed, not will be, but IS, no extra conditions. There are no verses from Paul that teach can become UNsealed before that day. Eph 1:13.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, Eph 4:30And grieve not the Holy Spirit of God, whereby ye are sealed unto the day of redemption. 1 Cor 15:1-4 Gospel that saves, justifies, seals