A new heart and a new spirit

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Why Is It That So Many Christians Find It So Hard To Live The Christian Life?

Notice, now, "I'll give you a new spirit, and I'll put My Spirit…" Notice, the new heart is put right in the middle of you. And the new spirit is put right in the middle of your new heart. And His Spirit is put right in the middle of the new spirit.
It's just like the mainspring in a famous watch. When that… When that mainspring sets in the middle of the watch, it controls every movement of that watch. And that's what's the matter, friends. Now, I hope you see this. And I'm not saying it to be—try to twist or be indifferent; I'm only saying it because I know that someday I'll stand in the judgment with you. You see, if the Holy Spirit is in the middle of your spirit… And that watch spring makes all the rest of the movements just tick just exactly to the place, keeping perfect time. When the Holy Spirit is in the middle of your spirit, it makes every action of the Holy Spirit in you tick off just exactly according to God's Timepiece, the Bible. Right.

Daily Bread Ezekiel 36:26-27
A new heart also will I give you, and a new spirit will I put within you: and I will take away the stony heart out of your flesh, and I will give you an heart of flesh.
And I will put my spirit within you, and cause you to walk in my statutes, and ye shall keep my judgments, and do them.