A few apostates are outspoken and aggressive in their opposition to the truth, but most are subtler. Regardless of how friendly, benign, or self-effacing they may appear, these wolves in sheep’s clothing are invariably driven by evil and self-aggrandizing motives—such as pride, rebellion, greed, lust, or whatever (2 Peter 2;10-19). That is not to suggest they always know full well that they are apostates. Many of them are so blinded by their evil desires that they really imagine they are serving Christ when in fact that are opposing Him (John 16:2).
– John MacArthur
Christ Alone Wyoming 
Johnny Mac is spot on again!
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How does John Macarthur know what he is saying is true? Isn’t it circular reasoning to use the Bible to prove the Bible?
And why is honest disagreement with John Macarthur a sign of bad motives? Isn’t this a form of ad hominem attack, and not dealing with the substance of another person’s argument?
What do you think?
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Actually, MacArthur isn’t using the Bible to prove the Bible. He is using the Bible to expose those who are false teachers.
Suppose someone says they are 6′ tall. So, to prove it, someone pulls out a 6′ long measuring stick. Are they using the measuring stick to measure the measuring stick? No. They are using the mesasuring stick to validate (or invalidate) the person’s claim to being 6′ tall.
That’s what MacArthur is doing. He is measuring the false teachers’ words by the measuring stick that is the Bible. It’s not “disagreement with John Macarthur” that is the issue. It’s disagreement with the word of God.
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