This is a bit long, forgive me, but it's an important subject that requires more explanation than a sentence or two. The mind (the grey matter between the ears) is just a processing center, to make a judgement based on input from the five senses. The mind/heart from the scriptures is the DNA in every cell of our bodies. Scientists arrogantly say that 97% of our DNA is junk. That "junk" is our lifetime of decisions, our understanding that the processor (the brain) judges and is sent to the beating organ in our chest which then converts it to a belief and stores it in our DNA, if it agrees with the judgement. Hence David cried out to God to search his "heart" to see if there was any wickedness. Jesus claimed the devil had nothing in Him. Our sins and choices and beliefs are stored in our DNA. The devil couldn't get into Jesus' because Jesus obeyed the Spirit completely (and never had sin in His DNA to begin with.) This is why when the mind believes something that the heart (beating organ) doesn't agree with, nothing happens in prayer. Our experiences in life are based on the five senses. As a Christian, that's the "old man". When we become Christians we gain a dormant sense: spiritual awakening. Some call it intuition, others the "sixth" sense and is indeed a latent existence from Adam's sinless days. Or as Paul says, the word of God is written on our hearts and others call it our conscience. We are taught by the world to ignore this sense. Or as Paul also says "searing our conscience with a hot iron." Either way, it is the word of God written in our DNA. It is what the Holy Spirit uses to convict us, to guide us to obedience when we don't have enough information for the brain to decide the matter. So when the brain believes something the beating heart does not, nothing is deposited into our mind/heart (DNA). However if the heart/mind believes, it overrides the brain's judgement. Like "Love is blind". No matter what your brain says the heart takes over without sound judgement! Remember your first love? It's a process, just like Paul said, to be fully persuaded. So in order to believe God, though our brain may agree, it's a matter of the beating heart that must agree before it becomes life to us and use it. Belief doesn't need to know why. Belief is a strong conviction of a matter. So if we trust God, when we don't have enough facts to support a decision to obey, and we obey, that's trust; that's faith. Like a parent to a child. The child trust the parents to obedience without understanding the whys/hows/whats of life; until they begin to question - and that is doubt, the very definition in the Greek: to cast judgement against a decision. Here's an example: The promises of God. The brain may read the words of God and His promises, but the heart doesn't believe it because it hasn't experienced them per se. The issue is a matter of experience. It's easy to believe an ethereal "thing" than a "thing" contrary to the physical. Case in point: healings. The word of God promises them, but because the heart doesn't believe it, nothing happens when the brain makes the mouth pray for deliverance and then when nothing happens - because the "heart" wasn't in it, the mouth declares, "See, I told ya." That's not being fully persuaded. The beating heart must be convinced - the very definition of "faith" - strong conviction, a belief. Because men "of God" don't really believe the word of God and His promises, they make up excuses (called theology) to explain why the promises of God failed -- like "It was only for the apostles" -- ignoring the fact that the 70 got it too. Either way, they don't believe the word of God and live in utter ineffectiveness and unproductiveness in Jesus. Peter spells this out completely in 2 Peter 1:3-8. So how does one believe the word of God without understanding all the nuances: faith. Faith is the strong conviction of a belief. We believe that Jesus died on the cross for us to be saved. Joel and Paul said if we call upon the name of the Lord, we'll be saved. That's easy to believe because "1, 2, 3, pray after me" doesn't require change. But true salvation does require change. If someone just spits out a formula without the heart involved, then they're living in denial and going to hell. They could be the best pastor and do all the right things, but Jesus will say "I never knew you!" God doesn't want behavioral modification, He wants heart transformation! The measured output of belief of the heart if 5000 times greater than that of the thought of the brain, scientists say. The heart is it. This is why we have the phrase "the heart of the matter". Heart is one of the most used words in the KJV bible. Used over 765 times. Now, if you've lasted this long, reread the parable of the sower. It should make more sense now. The truth (word of God) is given (the seed) and the hearers are mulling over the information in their brains, but get distracted and the devil swipes the seed away making you forget it. Then there are those that accept the word of God but because the heart isn't fully persuaded, when events in the world occur the seed is rejected. The same with those that have made it past the brain and into the heart, but the stronger beliefs choke it out because of their past experiences. Finally, the good ground, accepts the word of God, processes it, sends it to the heart and the heart is teachable and pushes out the belief, over writing the DNA with the truth, storing the belief. With that belief they grow in Christ and bring about fruit and patience. After all the scriptures say that the invisible is more real that the visible, Col 2:17; Heb 8:5; Heb 10:1. So the question is, does your heart truly believe the word of God to act on His promises and effect change in the fallen world? After all, that's why we're still here, to reconcile man to God with power. Do yo believe these verses? Phil 4:13 (KJV) I can do all things through Christ which strengtheneth me. Mark 11:24 (KJV) Therefore I say unto you, What things soever ye desire, when ye pray, believe that ye receive [them], and ye shall have [them]. Matt 18:19 (KJV) Again I say unto you, That if two of you shall agree on earth as touching any thing that they shall ask, it shall be done for them of my Father which is in heaven. 2Cor 1:20 (KJV) For all the promises of God in him [are] yea, and in him Amen, unto the glory of God by us. Gal 6:7-8 (KJV) Be not deceived; God is not mocked: for whatsoever a man soweth, that shall he also reap. For he that soweth to his flesh shall of the flesh reap corruption; but he that soweth to the Spirit shall of the Spirit reap life everlasting.