And when you heard the word of truth (the gospel of your salvation) – when you believed in Christ – you were marked with the seal of the promised Holy Spirit,—Eph 1:13 NET
The Lord puts a seal upon His own, that everybody may know them. The sealing in your case is the Spirit producing in you likeness to the Lord. The holier you become, the seal is the more distinct and plain, the more evident to every passer–by, for then will men take knowledge of you that you have been with Jesus. — Andrew Bonar.
Daily Quiet Time - February 15
Public domain content taken from Devotional for the Quiet Hour by D.L. Moody.