Brilliant deduction! Just to emphasize that we are not "currently" free from many forms of "thought" constraint, I might remind all of us that our true freedom is a promise, yet to be fulfilled. Paul references it here, for example:
Romans 8:
19 For the earnest expectation of the creature
waiteth for the manifestation of the sons of God.
20 For the creature was made subject to vanity,
not willingly, but by reason of him who hath subjected the same in hope,
21 Because the creature itself also shall be delivered from the bondage of corruption
into the glorious liberty of the children of God.
22 For we know that
the whole creation groaneth and travaileth in pain together until now.
23
And not only they, but ourselves also, which have the firstfruits of the Spirit, even we ourselves groan within ourselves,
waiting for the adoption, to wit, the redemption of our body.
There is a difference between a promise, and the realization of that promise. There is a difference between HOPE, and actual receipt of what we HOPE for.
Currently, we have the promise, the HOPE and are in fact in groaning, travailing pain. Certainly not the "glorious liberty" that is to come, at which point we will be "free."
We all, currently, have an evil conscience or "evil present" with us as Paul noted in Romans 7:21 for himself. Paul was honest. Most believers, unfortunately are not on this particular subject matter. Whether any believer can be honest about it or not, it is beside the point. Jesus tells us that it's a fact, here:
More Light Matt 13:12, Mark 4:24 and Luke 12:48.
No person can be 'free' with EVIL PRESENT with them. That's really all there is to it. Some claim that is free. I say it's an internal binding that God Himself has put us UNDER. And I'll use the best reference for it, imho:
Romans 11:32
For
God has bound everyone over to disobedience so that he may have mercy on them all.
Some, blinded as they are, will claim that to not be the case. Sorry. It's just a fact. Openly exposed in the world and with believers, every single day, belied by every evil and imperfect thought in the populace in general. Some believers, even here at this site, as so delusional that they'll claim to never have an evil or imperfect thought, and they expect others to believe them.
Any person can test the premise of "evil present" with them in their own minds according to the principle Paul lays out in Romans 7:7-13. And what they will find, if they are honest, is sin indwelling their own flesh and mind. If they don't they are just blinded to it by that working and have been turned into liars about it. I think they'll be saved from it anyway. It's a growth process we all go through. Sooner or later every thought will be brought before our Maker. Yes, every last thought.
Absolutely that will happen! We will be changed. We will no longer have a body that is subject to corruption, weakness, dishonor (all from 1 Cor. 15:43-49) evil present with us (Romans 7:21) death, etc etc. These are all "fixed" conditions FROM GOD for every natural/flesh person in this present life.
Far far from "FREE" or freewill. Some even think that because they CAN think evil, it proves they are free. So, I say, if you are so free, then try NOT TO. Prove your freedom. Good luck with that. Most see they are just lying hypocrites if they think they can do that. But some actually go further into that deception.
The point of it is this. God has placed us in this situation in order to understand and receive DIVINE MERCY.
God is entirely justified to use evil/sin for that lesson.