Of course truth is in the eye of the beholder.
Of course this is a distortion of the Platonic quote,“beauty lies in the eye of the beholder.”
As both truth and beauty have their objective source in God they, along with goodness are all objective(i.e. they are independent of the knowing subject) and self-evident.
What is good and true is necessarily beautiful; what is true and beautiful is necessarily good; and what beautiful and good is necessarily true.
Without the beholder there is no truth that means anything.
The problem is that you are making an objective statement that truth needs a “beholder”.
The statement itself is self-contradictory.
The answer to your other questions stem from the mentioned truth about the truth. Old words written down in some half forgotten language means nothing unless given a voice from a live practitioner. I.e I value your opinion more than theirs.
Those “old words written down in some half forgotten language” necessarily came from a person who was a “live practitioner”.
It is rather puzzling also that you’d demonstrate an apparent prejudice and/or bias against such people as if they don’t have anything to say.