Truth is eternal. Truth is. Truth simply is. It is never new, it is never old, or, it is as old as mountains and as new as the dewdrops on the grass leaves in the early sun. It is both and it is neither; it is both and beyond.
But you cannot arrive at this conclusion only by thinking, you will have to move into experiencing.
Truth has to become an existential phenomenon to you: you have to live it. Only by living it will you be able to know it, not vice versa; not by knowing it will you be able to live it, no.
That's what has been traditionally told to you: know about truth so that you can practise and live it. That is utter nonsense. Live truth so that you can know it. Living comes first, experiencing comes first, and then the shadow falls on your intelligence too and your intelligence can make an understanding out of it.