The word "spirit" is used in different ways in the bible. The most frequent refers to either the Spirit of God or the spirit of man. But the word "spirit" can also describe a mental attitude (Strong).
In Ephesians 1:17, Paul is praying that what is already true in our spirit will become our "mental attitude." He's praying for a release into the physical of what is already present in our spiritual being.
The Christian life is not an attempt to get more faith, or more anointing, or to get closer to the Lord. We already have these things in their fullness. We just need a revelation of what is already ours. Understanding this takes a lot of frustration and doubt away. It's much easier to release something you already have than to try and get something that you don't have. And why would anyone doubt whether or not he could receive what he already has?
Through Christ, we are already blessed with all spiritual blessings. All we have to do is use what is already ours, through the renewing of our mind.
If we will change our thinking to believe what God says in His Word about who we are and what we have, then our flesh will experience the life of God that has been deposited into our spirit.
