ISB ~ Ephesians 1 v13

sealed:In the ancient world, seals were marks of ownership and protection (4:30; Ezek 9:4-6; Rev 7:4). Believers are divinely sealed by the Spirit. The Church Fathers employed this language to describe the indelible mark impressed upon the soul in Baptism, Confirmation, and Holy Orders (CCC 698, 1272-74, 1296). See note on 2 Cor 1:22.

•In Pauline theology, Baptism does to the soul what circumcision did to body: it marks it with the sign and seal of the covenant (Rom 4:11). See note on Col 2:11.