Ephesians 1:13 & 14

"And you also were included in Christ when you heard the word of truth, the gospel of your salvation. Having believed, you were marked with a seal, the promised Holy Spirit, who is a deposit guaranteeing our inheritance until the redemption of those who are God's possession - to the praise of his glory." NIV translation

This passage can bring so much peace to the life of a Christian. You see, Paul is letting us know that we don't have to walk around wondering whether we are saved or not. We can know because, if we have the Holy Spirit , then we are assured that we are His. We can praise God in that He did not leave us wondering around in doubt about our eternal destiny! 

We are also reminded that, when we believed, we are "included in Christ" and that reminds us that we are one and belong to Him not a denomination or "church building" or anything else. Christ only has one body and, if you have that Spirit, then you are a part of it and you do not have to join anything else.

Ephesians 1:15 & 16

"For this reason, ever since I heard about your faith in the Lord Jesus and your love for all the saints, I have not stopped giving thanks for you, remembering you in my prayers." NIV translation

Once again, we see that Paul was a man of prayer and he was constantly lifting up other believers. It is interesting to note here that he not only heard about their faith but also their love for the saints. That is how faith is demonstrated and so Paul knew that it was a real faith and he was thankful for them.

Ephesians 1:17

"I keep asking that the God of our Lord Jesus Christ, the glorious Father, may give you the Spirit of wisdom and revelation, so that you may know him better." NIV translation

Paul gives us a look at a specific request that he presents to God. He is asking that they would have and understand the gift of wisdom that they have through the Holy Spirit. He knew that all wisdom and understanding comes from God because of Jesus' words (in John 14:26) where He promised believers the Counselor (Holy Spirit).