The body doesn’t lie.
When you have trustworthy information in respect to a subject—let’s say, you know the truth—and you try to lie, in some way your body will give a sign that your words don’t match what you know. That’s why when a person lies, they tend to manifest one or more of these physiological signs: getting nervous, shaking a hand or leg too much, change of breathing, getting tense, shifting the eyes in an unusual way, heart racing etc. Basically, the body denounces the lie and the liar.
This is a very important fact for your faith. Why? Because faith only works when it is supported by a truth. If I know something is not true, it’s impossible for me to have faith in that. On the contrary, I would have doubts.
Now see if this doesn’t remind you of what Jesus taught about how faith works:
For assuredly, I say to you, whoever says to this mountain, ‘Be removed and be cast into the sea,’ and does not doubt in his heart, but believes that those things he says will be done, he will have whatever he says. Mark 11:23
There it is: when the mouth speaks it but the heart doubts, there is a division in beliefs, that’s when faith doesn’t work. If my body, that doesn’t lie, knows that something I’m saying is not true, so there is a conflict of beliefs; so I will be divided, taken by doubt. And in doubt, I don’t conquer anything.
That’s why many people say they have faith in God but barely ever get any benefit out of this faith. They say something with their mouth, but their body, their mind, and their whole physical structure does not agree with their words. So their prayers don’t work. Now, if the polygraph can tell you’re lying, imagine God? And what about the devil, the father of lies? Could it be that he doesn’t know how much you’re lying?
You say you believe in God, but you live as though He doesn’t exist.
You say you love Jesus, but you do what He hates.
You said you did your best, but your body knows what you could have done more.
You say you believe in the word of God, but you fill up on the negative words of others.
You say God is first in your life, but through your works you put Him second, fifth, or even in last place.
How do you want to see a result of your faith if what you do disagrees with what you say?
The body doesn’t lie.
Therefore, faith which moves mountains is the one that unifies mind, body, words, and heart. All your being is focused on a belief, one truth only.
What to do with this information?
Identify the truth. Your word is truth. John 17:17
Believe in the truth with all your body (attitudes,) soul (heart,) and spirit (mind.)
Put all your efforts (sacrifice) into action in service of the truth that you believe in.