Ephesians 1:13-14 In him you also, when you heard the word of truth, the gospel of your salvation, and believed in him, were sealed with the promised Holy Spirit, who is the guarantee of our inheritance until we acquire possession of it, to the praise of his glory.
If you are a follower of Jesus Christ, there was some point at which you heard God’s Word, felt His prompting, and responded. This might not be an exact moment that you can pinpoint on a calendar, but the fact that there was a period of time over which this process was occurring is certain. God was working in you and you responded to His call. You became part of His family. And He sealed you.
Much like the seal of royalty in times of old, a wax emblem placed on a document so it could only be opened by the rightful recipient, God has placed His seal on us with His Holy Spirit until the right time for our inheritance. No one can snatch us from the Father’s hand (John 10:29). He has guaranteed our inheritance as His sons and daughters.
Likewise, in the same way the seal of royalty showed the king’s approval of the document (his endorsement), God has stamped His endorsement on us from the time that we believed on Christ for our salvation. Rest assured. If you are a believer, you belong to the Lord and He belongs to You.