This passage has always been used, inappropriately and out of context, to prove Calvinism. Let's take a look once again.
3 Blessed be the God and Father of our Lord Jesus Christ, who hath blessed us with all spiritual blessings in heavenly places in Christ:
4 According as he hath chosen us in him before the foundation of the world, that we should be holy and without blame before him in love:
What was chosen before the foundation of the world were the spiritual blessings in heavenly places in Christ. In Christ is the key. The entire chapter are the things found in him, in Christ, in the beloved. The word, "according" takes us back to verse 3 to the context. However, it does not say that he chose us to be in him, as Calvinist somehow think it states.
As I said before, I'm surprised at you for adding to the text.
Let's look at the context more thoroughly... this is Ephesians 1, so we only have two verses of context:
1 Paul, an apostle of Jesus Christ by the will of God, to the saints which are at Ephesus, and to the faithful in Christ Jesus:
2 Grace be to you, and peace, from God our Father, and from the Lord Jesus Christ.
3 Blessed be the God and Father of our Lord Jesus Christ, who hath blessed us with all spiritual blessings in heavenly places in Christ:
4 According as he hath chosen us in him before the foundation of the world, that we should be holy and without blame before him in love:
5 Having predestinated us unto the adoption of children by Jesus Christ to himself, according to the good pleasure of his will,
In verse 1, Paul addresses his letter to "the saints" and "the faithful in Christ Jesus"...
people.
In verse 2, Paul simply conveys greetings, so this tells us nothing more about the context.
In verse 3, Paul blesses God and tells us that God has blessed us with heavenly spiritual blessings in Christ. This tells us something about God.
In verse 4, Paul starts a very long sentence (in Greek) that continues through much of the chapter. The context is
after this verse,
not before it! If you look at each verse in the KJV, you'll see how most are structured as clauses without periods at the end.
So, the words, "spiritual blessings in heavenly places" is
not the context for "chosen us in him".