'Understand' in the Bible

But these men, like irrational animals -- creatures of instinct, born to be caught and destroyed -- do not understand whom they are insulting, and consequently in their destruction they will be destroyed,

Above all, understand this: In the last days blatant scoffers will come, being propelled by their own evil urges

speaking of these things in all his letters. Some things in these letters are hard to understand, things the ignorant and unstable twist to their own destruction, as they also do to the rest of the scriptures.