Ephesians 1:3 "Praise be to the God and Father of our Lord Jesus Christ, who has blessed us in the heavenly realms with every spiritual blessing in Christ."
Where are the spiritual blessings located? Answer: in Christ
How do I get spiritual blessings? Answer: from God the Father through the Lord Jesus Christ
How many spiritual blessings can I get? Answer: all of them
What do I have to do to get these blessings? Answer: you get them through faith in Christ
So, what do I need in addition to Jesus Christ? Answer: nothing
What am I lacking if I only trust in Christ? Answer: nothing
What else do I need to contribute to get them? Answer: nothing
Conclusion: union with Christ alone and by itself gives me every single possible blessing that it is possible to get from God.