'Understand' in the Bible

That seeing they may see, and not perceive; and hearing they may hear, and not understand; lest at any time they should be converted, and their sins should be forgiven them.

And when he had called all the people unto him, he said unto them, Hearken unto me every one of you, and understand:

And when Jesus knew it, he saith unto them, Why reason ye, because ye have no bread? perceive ye not yet, neither understand? have ye your heart yet hardened?

And he said unto them, How is it that ye do not understand?

But when ye shall see the abomination of desolation, spoken of by Daniel the prophet, standing where it ought not, (let him that readeth understand,) then let them that be in Judaea flee to the mountains:

But he denied, saying, I know not, neither understand I what thou sayest. And he went out into the porch; and the cock crew.