In the same manner, these reference books quicken the time it takes to look up passages, or define certain words. But, when used properly, they neither add to, nor take away from, the actual Word of God. The second type of books written about the Bible are the books written in an attempt to interpret the Bible. Some are good, some are just plain unacceptable. These are the books where a certain author undertakes to express, in his or her own words, Biblical doctrines.
Commentaries are one example.
These are the books where Bible passages are not merely listed, but rephrased. In these types of books men attempt to answer, in their own words, the questions the Bible seems to raise. As we return to our food analogy we find that today many health professionals warn us of man-made food additives. Man's additives have turned that which is necessary into that which is lethal. It is the same with the Word of God.