which he lavished upon us, in all wisdom and insight making known to us the mystery of his will, according to his purpose, which he set forth in Christ as a plan for the fullness of time, to unite all things in him, things in heaven and things on earth.
-Ephesians1:8-10
The riches of his grace have been lavished upon us. Do you know what "lavish" means? I figured I'd look it up to make sure I didn't get it wrong, "bestow something in generous or extravagant quantities upon". How cool is that? The riches of his grace have been lavished upon us. NLT uses the word "showered". It makes me want to sit back, ponder and sit in amazement of our God. Praise be to God.
Paul moves on to talk about God "making known to us the mystery of his will". This is done "in all wisdom and insight", though it's arguably connected to the previous thought. What is this that he made known to us? Paul explains this later in Chapter 3 when he talks about the Mystery. It's essentially the gospel, the good news. We see even here that this mystery of his will "he set forth in Christ". It has to do with Christ further points us to it being the gospel.
We see yet again something about God's purpose, "according to his purpose". God chooses and decides what he is going to do, it is according to what he wants to do. AMP puts it, "according to his good pleasure". God was pleased to do this. It made me think of the word "pleased", which I remember reading... Galatians.
But when he who had set me apart before I was born, and who called me by his grace, was pleased to reveal his Son to me, in order that I might preach him among the Gentiles
-Galatians 1:15-16a
It pleased God to reveal his son to Paul. Similarly, I think Paul is saying here in Ephesians that God was pleased to reveal the mystery of his will to us.
There are a few remaining things. The plan is to unite all things in him. Here, him is referring to Christ. The purpose of all these things is to unite all things in Jesus. Christ will be exalted and Christ will be praised. It is all for his glory. This is a good thing and there's nothing wrong with God doing things for his glory. He "who has blessed us in Christ with every spiritual blessing in the heavenly places", choosing us, predestined us, adopted us, and lavished us with the riches of his grace, it is him that I exalt.