'Flesh' in the Bible

and especially those who indulge in the corrupt passions of the sin nature, and despise authority.Presumptuous and reckless, self-willed and arrogant [creatures, despising the majesty of the Lord], they do not tremble when they revile angelic majesties,

For uttering arrogant words of vanity [pompous words disguised to sound scholarly or profound, but meaning nothing and containing no spiritual truth], they beguile and lure using lustful desires, by sensuality, those who barely escape from the ones who live in error.