'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."

Is it not the wheat harvest today? I'll call upon the LORD, and he will send thunder and rain. Then you will know and understand that you have done a great evil in the sight of the LORD by asking for a king for yourselves."

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

Looke, my father, look! The corner of your robe is in my hand. Indeed, by my cutting off the corner of your robe and not killing you, you may know and understand that I have no evil intent or transgression I haven't wronged you, even though you are hunting me 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."