I tried to get to the bottom of
'the truth' last year when I researched the legend of the 'Flying Dutchman' - I lived in an area then where the ghost ship was seen repeatedly, and
very believably. Fascinating stuff, by the way, you can read my
article about it if you want.
The conclusion I came to is that there is indeed no such thing as 'the truth' - everybody has their own truths (plural) because from our limited perspective, none of us know enough to be absolutely 100% sure about anything.
There are certain things that a great number of people agree upon, and if this number is overwhelming, then these things are labelled 'the truth'. The term implies that 'the truth' is something that is absolute, that never changes - but that doesn't exist : the only certainty is change.
But is that 'the truth'?
The truth of the Middle Ages was that the earth is flat and you'll fall off if you sail far enough. Today's truth is that calories have an effect on our body weight ...
'The Truth' is relative - very, very relative. Albert Einstein knew this even before he explored Quantum Physics.