Unchangeable Truth

i was listening to NPR, and they were interviewing someone who was doing a rendition of 'Messiah', and she said that the 'Messiah' performed today has some differences frm the original and that it has 'evolved.'
well, it's nothing new; it happens in many fields. even the current tech world is constantly changing. very few, if any, still use MS Windows 3.0.
well, it's not just in the comp field, but also in science and medicine. sometimes, what we always believed to be true changes. but, there r also some unchangeable truths.
some truths do not change. it can't. if there is no unchangeable truth, then there is no use/meaning in what we say/write/do.
i believe that what has always been will always be. unchangeable truths are never dependant on our understanding for their existence. no matter what we believe or understand, the unchangeable truth is always going to remain the same. our understanding of the truth may change, but the Eternal Truth does not.
now, why did i say all this for? i don't know . . . may be just to give some a headache or something to think abt :)