Premise .1

Once upon a time (and by that, I mean from the beginning of time until about twenty years ago) it was unnecessary to defend the notion of truth. It was just assumed that only the insane and children too young to comprehend coherent thought would not take for granted that absolute truth was just a given. Sadly, there are some misled people who have shown up on the scene, spreading their "No absolute truth" propaganda.
That having been said, I suppose, rather than starting with important things, I need to establish the existance of absolute truth.
It needs to be understood that all claims of belief, truth, or existance are made in propositions. Propositions are ideas offered for acceptance. They are inherently indicative statements. Questions are not propositions because they can carry no truth. Similarly, opinions or emotive declarations can not be propositions. Saying, "I think ...." or "I really like..." are not propositions. Propositions are meant to corrospond to reality. Truth, therefore, is a proposition or a set of propositions that corrosponds to reality.
A lot of people who subscribe to the postmodern worldview like to say that they believe that there is no absolute truth. (Whether or not they actually believe that I think is debatable. But that's another issue.)
But the problem is that in order to believe that there is no absolute truth, one has to subscribe to the proposition, "There is no absolute truth." This is a self-refuting proposition. In order for this proposition to be true, there can not be anything proven to be true, including the proposition. This proposition sets up restrictions for truth that it cannot fulfill itself. If the proposition is true, then it is not true.
The conclusion must be that some things are inherently true. Of course, if some things are inherently true, then it must follow that some things are inherently untrue as well. Thus, there is truth and there is untruth.
Some would say that what is true for one may not be true for another. But if a proposition corresponds to reality, if it is inherently true, it must be true regardless of whether one believes it or not; it is true for everyone (or, put more simply, it is true). Truth is not subject to opinion or vote. Truth is just truth. Truth exists.

I have a working theory on why some claim to believe that there is no absolute truth. Now, bare in mind that this section has not been varified or proven logically. Its proof lies only in my own observation and experience. This is merely speculation, but, I think, fairly accurate.
My theory is that the idea of the non-existance of absolute truth has its roots in personal insecurity. The problem is not that truth exists, that some propositions are accurate and others are not. The problem is that there is such a need among some to be accepted that they have a problem telling others that what they believe is untrue. No one likes to be told that they are wrong. You don't make many friends going around telling people that something that they hold to is inaccurate and false.
But this blog site will be a designated truth zone. I have no qualms about telling the truth, regardless of whether people believe or not. I would like to be your friend. But if I say something that you don't agree with, you just might offer me the big "Screw You." That's no skin off my back.
Here's the thing. If I say something that you don't agree with, you have two choices. You can either split and never read my work again or you can refute what I say with a logically stronger argument. My number one goal is truth. If what I say can be proven wrong, I'd sure like to know. "The way of a fool is right in his own eyes, but a wise man listens to advice." (Prov. 12:15, ESV)

For more information on the existance of truth, see Douglas Groothuis, Truth Decay: Defending Christianity Against the Challenges of Postmodernism (InterVarsity Press: Downers Grove, 2000), ch. 4.