... we may indicate three minimum requirements that must be fulfilled before any belief can claim the status of knowledge:  (a) a belief must be base on evidence; (b) a belief must be internally consistent (i.e. not self-contradictory); (c) a belief cannot contradict previously validated knowledge with which it is to be integrated.  If a belief fails to meet any or all of these criteria, it cannot properly be designated as knowledge.

George H. Smith
From: Atheism: the Case Against God
[Gun control advocates, socialists, and other anti-freedom advocates would do well to understand the difference between belief and knowledge as outlined by Smith above.--Joe]