Jesus said, "My meat is to do the will of Him who sent me." What this means that if Jesus said anything expecting it to come to pass, it had to be in the centre of the Father's will for His ministry.
This is supposed to be the heart of our motives.
From within the context of the original question, does it bring infirmity on your body to state say so? Would that constitute a curse?
I believe the answer is that rather than "bringing a curse", it simply allows the unredemptive reality to prevail in your body. It's not wrong to be sick, and although sickness relates to the fall, you can not take care of your body or back on your own (no devils involved at all) and you can legitimately come up with the statement in question (damage your back or be sick).
But the higher kingdom reality is that Jesus paid for your healing in your back. If you know that and have knowledge on how to appropriate healing for your back by acknowledging what Jesus did (calling for it, preferably by scripture), then you at least begin to put the promise to work on your behalf.
The whole "proper speech" thing should be based on the flow of the Spirit in agreement with the Word of God. If our words are directed by the Holy Spirit, and our tongues bridled (cooperating with the grace of God), then what we say won't depart from the truth of scripture.
That shouldn't keep us from acknowledging that we need prayer for physical problems (if we do), but it's just being mindful of the higher kingdom reality (which is your inheritance).
The Mk 11:23 thing from a perspective other than prophetic influence by the Spirit of God really is a form of witchcraft. Yes, man has authority on this earth and his tongue and a believing heart are a means to bind and loose the causative spirit realm to influence this physical realm (and witches do). But a believer's thoughts and words should be directed by God from a "Spirit filled" source.
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