Answer:
To agree without understanding is insane, means that in agreeing you have to understand why your are agreeing on that dilemma, because if you agree without understanding it, you are insane. To disagree without understanding is impudent, means you are lack of discretion when disagreeing in a dilemma when you do not have an understanding about it. It is very important to to know first the background of what you are agreeing or disagreeing, since it might affect you and to other people. Thus, it means generally that we have to understand where we stand in any dilemmas.