'Understand' in the Bible

But these people, like irrational animals—creatures of instinct born to be caught and destroyed—speak blasphemies about things they don’t understand, and in their destruction they too will be destroyed,

The Lord does not delay His promise, as some understand delay, but is patient with you, not wanting any to perish but all to come to repentance.

He speaks about these things in all his letters in which there are some matters that are hard to understand. The untaught and unstable twist them to their own destruction, as they also do with the rest of the Scriptures.