Salvation -- it's all from God, by God, from start to finish. Grace.
The first two words of Ephesians 2:4, "But God..." trace a long history of God's presence and work in the lives of His people.
Before we really understand why the good news is so good, we have to really understand the bad news.

Who brings us grace? Only the beloved Son of God, our Redeemer!
All the blessings of heaven given to us spring from one source - the deep love of the Father!