this was not revealed to you by flesh and blood, but by my Father in
Revelation - the lemma here is apocalypto -- always comes from the Father. It does not matter whether a message is emblazoned on the mountainside or announced by a hundred heralds, unless the Father reveals the message it will remain a parable and will not be understood.
Matt 13.11-16 (ESV)
And he answered them, “To you it has been given to know the secrets of
the kingdom of heaven, but to them it has not been given [...] This is
why I speak to them in parables, because seeing they do not see, and
hearing they do not hear, nor do they understand.
Indeed, in their case the prophecy of Isaiah is fulfilled that says:
“‘“You will indeed hear but never understand, and you will indeed see
but never perceive.” For this people’s heart has grown dull, and with
their ears they can barely hear, and their eyes they have closed, lest
they should see with their eyes and hear with their ears and
understand with their heart and turn, and I would heal them.’
But blessed are your eyes, for they see, and your ears, for they hear.
Many people heard the words "messiah", but they misunderstood that as someone that would be an earthly king, or save the jewish people, etc. That is, they saw everything according to the flesh, as a wordly thing. Even today, most cannot understand Christ, because they cannot understand spiritual things:
2 Cor 3.12-17
Therefore, since we have such hope, we use great boldness of
speech—unlike Moses, who put a veil over his face so that the children
of Israel could not look steadily at the end of what was passing away.
But their minds were blinded. For until this day the same veil remains unlifted in the reading of the Old Testament, because the veil
is taken away in Christ. But even to this day, when Moses is read,
a veil lies on their heart. Nevertheless when one turns to the Lord, the veil is taken away. Now the Lord is the Spirit; and
where the Spirit of the Lord is, there is liberty.