What is Truth? There are three major theories with respect to truth. If you subscribe to the correspondance theory of truth, you believe that truth corresponds to what really is, that there is a direct relationship between true knowledge in your mind or brain and what actually exists outside yourself. If you believe that such a strict definition of truth is unrealistic, you may believe that truth is merely that knowledge which is internally consistent. That is the consistency theory of truth, whose archetype is mathematical logic, where consistency is a necessary condition for any proposition to be considered valid. If you are a pragmatist, you hold to the pragmatic theory of truth: truth is what works. Whether or not knowledge corresponds to external reality and whether or not it is consistent with other knowledge is immaterial. What counts is that what you believe to be true leads to valued ends. If it works for you, it is true for you, though it might not be true for someone else.
The Christian thinker James W. Sire defines a worldview as "a commitment, a fundamental orientation of the heart, that can be expressed as a story or in a set of presuppositions (assumptions which may be true, partially true, or entirely false) which we hold (consciously or subconsciously, consistently or inconsistently) about the basic construction of reality, and that provides the foundation on which we live and move and have our being." He suggests that "we should all think in terms of worldviews, that is, with a consciousness not only of our own way of thought but also that of other people, so that we can first understand and then genuinely communicate with others in our pluralistic society."