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, 14 who is the guarantee of our inheritance until we acquire possession of it, to the praise of his glory.

-Ephesians 1:13-14

In verses 11 and 12, Paul is talking about "we who were the first to hope in Christ".  NLT translates it as "we Jews who were the first to trust in Christ".  Now, in contrast, verse 13 moves on to talk about "you".  His readers, "the saints who are in Ephesus" are the "you" he is now talking about which is different from "we who were the first to hope in Christ".  Paul is now saying to the saints in Ephesus that they "were sealed with the promised Holy Spirit".  This, he tells them, happened "when you heard the word of truth", "and believed in him".  This gives us some insight into what happens when we first hear and believe.  When people hear and believe, they are "sealed with the promised Holy Spirit".  I'm assuming this happens to all because Paul says "you also".  This that he is describing happened to "we who were the first to hope in Christ".  I guess Paul wanted to encourage them and remind them of what happened to them and that it is normal among believers.

Paul goes on to talk about the Holy Spirit"  He is "the guarantee of our inheritance until we aquire position of it".  Back in verse 11, Paul is talking about "we who were the first to hope in Christ" and they "have obtained an inheritance".  When Paul addresses "you" in verse 13, I think what he is talking about this inheritance.  It is also rolled up in what "also" happened to them, which is what happened when they heard and believed.  When we hear and believe, we obtain an inheritance.  This inheritance is sealed with the promised Holy Spirit.

Once again, at the very end of this, we find a familiar phrase, "to the praise of his glory".  All this, the inheritance and sealing with the Holy Spirit ultimately is for God's glory.  We may certainly receive an amazing blessing in inheritance and such, but God gets all the glory.  All praise be to God.