'Understand' in the Bible

For I don't understand what I am doing. For I do not do what I want -- instead, I do what I hate.

But again I ask, didn't Israel understand? First Moses says, "I will make you jealous by those who are not a nation; with a senseless nation I will provoke you to anger."

but as it is written: "Those who were not told about him will see, and those who have not heard will understand."