the first is that stuff that makes up the continents and the planets, makes us up and makes up our minds. the energy and matter zipping around, the stuff that's really there when no one's looking, the stuff that makes it so we can look in the first place. it's the unknowable truth, the photons when we can't see, can't detect. it doesn't leave much for debate, since anyone claiming to know it automatically corrupts it. by definition the first kind is unknowable to our eyes and our instruments. to argue over the original truth is to explain magic by pulling rabbits from empty hats.
the second kind of truth are facts. the earth looks like a blue tangerine, o'donnell is a lesbian. zeus threw thunder and all that jazz. some people think it's true. that kind of true. this kind of truth doesn't leave much for debate, since most people besides extremists will accept these concepts as true. society depends on common beliefs about the world to function. we operate on such assumptions as language, mathematics, science, all of which are true because experimentation hasn't proved otherwise, and because we are able to utilize these truths without mishap.
the third truth is the kind we find when we gauge things by their lasting impact, significance, and meaning. love is true, is one example. but really love's always true, except when it isn't true anymore. worthwhile memories and the meaningful life and the hard-fought battle are also these kinds f truths. at least when writing a paper this is the only really interesting kind. but it's difficult to write objectively about the subjective, much less the subjective truth. a good course to follow in this case is to write a completely biased essay, since pretense of objectivity will probably just make you look clueless. i don't know, it might actually be a good idea to write about love; it helps to have a more tangible example of truth or not-truth than a lot of theories and ideas going back and forth.