If you search for truth it is best first to define what truth is this is a philosophical question and so there can be many answers all equally valid in their own way.
Plato believed that there are truths to be discovered; that knowledge is possible. ... Since truth is objective, our knowledge of true propositions must be about real things. According to Plato, these real things are Forms. Their nature is such that the only mode by which we can know them is rationality.
Aristotle's well-known definition of truth was “To say of what is that it is not, or of what is not that it is, is false, while to say of what is that it is, and of what is not that it is not, is true”
But if your search is for something to believe then that's a matter of faith and all you need to do is decide who to put your faith in and therefore who's version of the truth you are willing to accept.
By the way the poem was about one of the two truths or certainties of life Death and Taxes.
Translated as follows.
Death will come and your eyes will have
this death that accompanies us
from morning to evening, sleepless,
deaf, like an old remorse
or an absurd vice. Your eyes
will be a vain word,
a silent cry, a silence.
So you see them every morning
when you lean over yourself
in the mirror. O dear hope,
that day we too will know
that you are life and you are nothingness.
For all, death has a look.
Death will come and have your eyes.
It will be like giving up a vice,
like seeing
a dead face re-emerge in the mirror ,
like listening to a closed lip.
We will go down into the muti eddy.
Cesare Pavese
Truth is something difficult to ascertain all you can do is listen to as many opinions as you can and the use your own intelligence to pick the one or ones that seem rational and make sense to you.
You can after all only view the world through the lens of your own mind.
And remember truth as an absolute will always be the truth even if no one believes it.
A lie will always be a lie even if every one believes it.
Critical reading is always a good thing to try and I never trust rhetoric even if I use it.