INTROSPECTION - personal truth vs truth. What is THE truth?

Why bother with defining terms that belong to life? Life is beyond one's understanding, since life also goes well beyond physicality. Meaning is restricted to physicality, since, at its core meaning is also physicality. A vibration. If one attaches any sort of mental, psychological and / or emotional attachment to that, well... one has obtained a personal truth. And everything low-vibrational lives by personal truths, because this is how they get their own validation. Right?