"If you are not a Christian do not trust your mind; it is the most dangerous thing you can do." -- D. Martyn Lloyd-Jones

"...and if you are a Christian, do not trust your emotions!" -- My Mom

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If you are not a Christian do not trust your mind; it is the most dangerous thing you can do. But when you become a Christian your mind is put back in the centre and you become a rational being. There is no more pathetic illusion than for a man to think of the Christian faith as sob-stuff, the dope of the people, something purely emotional and irrational. The true view of it is stated perfectly by the apostle Paul in Romans 6:17. You have 'obeyed from the heart that form of doctrine which was delivered you'. The doctrine was preached to them, and when they came to see it they liked it, believed it, and put it into practice. They received the truth of God first of all with the mind. Truth must be received with the mind, and the Holy Spirit enables the mind to become clear. That is conversion, that is what happens as the result of regeneration. The mind is delivered from this bias of evil and darkness; it sees the truth and loves and desires it above everything else. That is it. There is nothing more tragic than for a man to find at the end of his life that he has been entirely wrong all the time.

From the book Studies in the Sermon on the Mount.

I'm sure we've all gone through this at some point. Being accused of blind, emotionally-needy faith. But our faith is not irrational. We are permitted by the Holy Spirit to perceive the truth and value it, receive it and then, as he said, practice it. It is not ritualistic or "sob-stuff". It is intellectually just plain smart. Salvation is the best example of a "good for you" proposition. It's just many people have a blinded eye (mind) and therefore become creatures of lust and desire, "whose eye is no longer single". That is one of the most subtle deeds of Satan. He persuades a man that by denying God he is being rational. The greatest faculty of all has become perverted.

Good book. Helpful in explaining the, at first, strange sounding verses 22-23 of chapter six in Matthew.