## flesh and blood have not revealed this to you ##
"no human being has revealed this to you" (See: [[rc://en/ta/man/translate/figs-metonymy]])
## the gates of Hades will not prevail against it ##
Possible meanings: 1) "the powers of death will not overcome it" (see UDB) or 2) it will break down the power of death the way an army breaks into a city. (See: [[rc://en/ta/man/translate/figs-metaphor]])