The Canon of the Bible
All Christians realize that if God has revealed Himself by
communicating His will to man, man must be able to know
 with assurance where that revelation lies. Hence the need
for a list (i.e., canon) of books of the Bible. In other words,
man needs to know without error (i.e., infallibly) what the
books of the Bible are.
There must be an authority which will make that decision.
The canon of the Bible refers to the definitive list of the books
which are considered to be divine revelation and included
therein.
A canon distinguishes what is revealed and divine
from what is not revealed and human. "Canon" (Gk. kanon)
means a reed; a straight rod or bar; a measuring stick;
something serving to determine, rule, or measure.