headscratch I'm confused. Truth is absolute, and the human mind doesn't have the power to change the truth from absolute to relative. That's because relative truth contradicts itself: if truth is relative, the statement "truth is relative" is absolutely true. Therefore the doctrine of relative truth contradicts itself, therefore: truth is absolute. Because truth does not call itself false - truth is true.
The best way to explain the human mind's real relationship to truth is by using a window: If a window is closed, it's closed for everyone. However, people can have different perspectives on the window - for example some people might think the window is open because of their angle on the window, and some people may not be able to tell whether or not the window is open or closed and claim that it is open to hide their ignorance. Then there are the people who look at the window and don't want to believe that it is closed, so they delude themselves into believing that it is open. But regardless: truth doesn't change and the window is still closed.
Now if we go back up to the salvation debate we just left: the Gospel is true, and it's true for everyone, regardless of whether they believe it or not. However, people can have different perspectives on the Gospel - for example some people might not think the Gospel is true based on their perspective, and some people may not be able to tell whether or not the Gospel is true and claim that it is false to hide their ignorance (and avoid swallowing their pride). Then there are the people who hear the Gospel and don't want to believe it is true, so they delude themselves into believing that it isn't. But regardless: truth doesn't change and the Gospel is still true.
The human mind is no match for God. If you think that your mind or other people's minds are superior to the omniscient and omnipotent (all-knowing and all-powerful) God, you lose. Because you're not more powerful than God and you can't overcome him using your brain. Lie #1 back in the garden: you can be like God, knowing good and evil. Your brilliance will be like God.
Nope, wrong. God is all-powerful and so infinitely more powerful than us that rebelling against him was our hands-down stupidest decision. We've been wrestling with our stupidity ever since. In fact, Scripture is actually the quickest way back to brilliance in my book because it gets your brain into the problems behind the surface issues.
I agree with this position literally as it is stated, but it seems to me a confusing way to word it in context. The weirdness comes from the words "Satan is true" - how can a person be true or false? Usually I would only attribute truth or lies to statements about objects or people, not objects or people themselves. For example "Satan exists" is a true statement, and "Satan is a liar" is also a true statement. As Jesus said: "There is no truth in him."
However, I would think that trust would apply to people - it seems that you are mixing the two up, but I'm not sure. Ironically, Satan can be relied upon to be a liar - he doesn't tell the truth. He's always twisting it and lying and spin doctoring, because he has nothing to gain from being honest. We shouldn't trust him, because what we think is the opposite of a lie is sometimes another lie - sin opposes itself to its own determent - but you get what I mean.
I'm not sure if this is relevant, but I'll throw this out there for free - I once had a long debate with someone about whether objects have inherent meaning. I maintained that they didn't, because meaning is whether something is true or false. If I say the word "rabbit", there's no truth or lies with just that word. There's the definition of the word: a burrowing, gregarious, plant-eating mammal with long ears, long hind legs, and a short tail. (as per Google) It is true that the word rabbit refers to that animal, but the animal itself has no truth or falsity about it. Not only that, but other languages have other words that refer to rabbits, and no word or language in reference to that animal is inherently more true or false than any other word.
This is one of the weirdest things of life: in order for truth or lies to be applied to an object, the object must exist in relationship to something or someone else, and that relationship must be indicated in your statement. However, for truth to really be true, you have to have something that all things operate in relationship toward. And all things have a relationship with God.
That's how I tell whether something is true: if it's consistent with what God says, then it's true. If it's not, it's false. Now I didn't use that truth determination method before I got saved, obviously: I used to understand truth in relationship to me. Which would be relative truth, but it still isn't true because I don't determine truth, and I never did, and that is absolutely true.
For example, if a rabbit is floating in the vacuum of space, it has no meaning to anyone, because it has no relationship to anyone. But if the rabbit falls out of its vacuum into the earth's atmosphere and crashes into your car window, it now has a relationship to you and to your broken windshield. (Also that would be a flaming super-rabbit to survive the vacuum of space and re-entry, which doesn't exist, but it's a ridiculous analogy to prove my point that is meant to be humorous.)
However, how do you know that the rabbit actually existed, other than your broken windshield? How do you know that it wasn't a meteor instead of a rabbit, and you weren't just imagining things? Or lying to yourself about the whole thing? How do you know that you didn't view the proverbial window wrong? Those doubts will eat you alive - something has to define truth other than you, and that person is God. Otherwise you'll never get anywhere. (Science would tell you that it was a meteor instead of a rabbit, but science is us observing God's creation and understanding the rules of how it operates. Since God set up the creation, God is the source of the rules that indicate that the what crashed into your window was a meteor.)
The answer to all of this is obvious, though: without God, there is no truth and there is no meaning. With God, there is truth and there is meaning. So in order to state truth, you indicate the thing's relationship to God. That's how we know that Satan is a liar. So if we indicate the rabbit's relationship to God, that relationship has truth. If we incorrectly relate the rabbit to God (which I just did 1 paragraph up) our statement is false and we are lying about the rabbit. Though Super-rabbit's powers of surviving in space would make for a cool story, we know that he doesn't exist.
Now I better stop talking and get myself out of this rabbit hole. 
