This quote suggests that it is better to evaluate a person based on what they ask, as opposed to what they reply with. It is saying that the questions a person asks can tell you more about their character than their answers. For example, if someone comes to you asking for advice, the questions they are asking could tell you a lot about their current situation and how much thought they are putting into it. This could be valuable information about the person that you could use to make a judgment about them.