'Understand' in the Bible

I don't understand what I am doing. For I don't practice what I want to do, but instead do what I hate.

Again I ask, "Did Israel not understand?" Moses was the first to say, "I will make you jealous by those who are not a nation; I will make you angry by a nation that doesn't understand."

Rather, as it is written, "Those who were never told about him will see, and those who have never heard will understand."