'Understand' in the Bible

They replied, "If you are going to send the ark of the God of Israel back, don't send it away empty. Be sure to return it with a guilt offering. Then you will be healed, and you will understand why his hand is not removed from you."

(Now the servant did not understand any of this. Only Jonathan and David knew what was going on.)

Look, my father, and see the edge of your robe in my hand! When I cut off the edge of your robe, I didn't kill you. So realize and understand that I am not planning evil or rebellion. Even though I have not sinned against you, you are waiting in ambush to take my life.

In those days the Philistines gathered their troops for war in order to fight Israel. Achish said to David, "You should fully understand that you and your men must go with me into the battle."