Before we study the areas of Bibliology (revelation and the Scriptures), 
Theology Proper (the doctrine of God), Christology (the doctrine of Christ), etc., we need to talk about some preliminary issues.
We’ve talked a bit about faith, the need to struggle for the truth, and the concept of belief. Belief in the Bible is not gullibility, but a reasoned decision to align oneself with God’s reality.
The opposite of truth, of course, is heresy, a word that means “choice.” Why are Jehovah’s Witnesses heretics? They affirm the existence of God, the inspiration of the Bible, and the need of salvation. They are heretics because they choose to deny the doctrine of the Trinity, the deity of the Lord Jesus, and salvation by grace alone through faith alone.
“Heretic” is a strong word conjuring up images of people being burned at the 
stake. But heresy, untruth, is all around us. It may take the form of a formal denial of biblical truth or the spirit of the age which tells us to live for ourselves.
Jude writes to urge us “to contend for the faith that was once for all entrusted to God’s holy people.” And that sometimes involves dealing with heresies.
(I’ve written a short booklet entitled Whatever Happened to Heresy which you can order here).
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