But because of his great love for us, God, who is rich in mercy, made us alive with Christ even when we were dead in transgressions—it is by grace you have been saved. For it is by grace you have been saved, through faith—and this is not from yourselves, it is the gift of God— not by works, so that no one can boast. (Ephesians 2:4, 5, 8, 9 NIV)
One thing I have recently learned is that when the bible repeats something, you better listen and take it in. Ephesians 2:8 is one of the first things you learn as a Christian and even if I have been one for years! I continue to learm from it and the paragraph where Paul mentions it.
The first part of Ephesians 2 shows us how much we need to be saved from what we naturally are. If you could not relate to it, please tell me your secret. Verse 4 shows us how we are saved and Paul continues by mentioning that it is by grace. Through this grace, we are seated with Christ by God.
I'm sure you've seen or heard that when you share a seat, you win a friend. We rarely seat with someone we don't know. In foodcourts, you ask the person that was at the table first if space may be shared. But by grace, it is God Himself who seats us with Christ and allows us every blessing that He has for Christ!
Still, by grace, Paul reiterates and adds that it is not what we could do that gives us salvation, it is by what God offers us. And with this offer, there is an assurance of the great plan He has for our lives.
Just remember that it is an offer. Salvation is available, if we accept Christ as our Lord and Savior.