The placebo effect can affect sensations (e.g. reduce pain) and things under control of the brain, (e.g. stress response, some immune responses). This can make it pretty powerful in conjunction with effective medical treatments, and for minor ailments, but beware placebo's dark twin, the
nocebo effect...
One interesting feature of the placebo effect is that it is subliminal or subconscious, and so it can work even when you know you're getting a placebo treatment.
The placebo effect works best when we are not really sick in the first place. When we are not really sick, of course, we have the ability to heal ourselves just by thinking. When we are sick, we have the ability to receive healing from God.
There are some limits to the placebo effect, or 'the power of positive thinking'. The effect is real, but a placebo will have little effect on a broken limb (though it could have an effect on the amount of pain one experienced).
The power of belief is incredible... I read in college, in a textbook, that they put people on medication, and the medication was working for them, then, without their knowledge replaced there medication with sugar pills and did a study... All of them were unaffected... The believed with their minds that they were taking medication that had been proved was working, and when they switched them, without their knowledge, nothing happened, nothing was or became different, nothing changed...
I take medication, and it helps, but, I believe and put faith in the fact that the medications have been proven to work for what I am using and taking them for... I also believe that ultimately, God made them in this day and age for people like me with similar problems for this day and age... I try not to question it, the fact that it's working, and does, is and has proven to work for people like me, with my problems... When I question it, I start having problems, so, I try not to, but take them "on faith" that they are working, and this seems to work best...
My ex takes medication, but, she's always looking up, information on the pills she takes, for and pays way to much attention to, all the side effects that only "some" a very small percentage usually, some people experience with that medication... She has to constantly try something else all the time, cause she starts having and experiencing "side effects", I think it's because she does it to herself, in a way, she doesn't pay any attention to the percentages, she just automatically thinks and believes that because some people do, that she is going to also, and, she does usually...
Miracles were possible in the past, due to, or mostly in part of the fact that they "believed" their own faith, working along with God, allowed it to be possible and happen, I think we all lack that kind of faith today...
God Bless!