An advisor can help you sort through the morality of an issue, even when the Bible is silent on it. That is not to say that you take all advice at face value. All this is not to say that you should simply go to your favorite mentor or your mother and let them decide for you. It's not that simple. You are searching for God's voice through your advisors.
Advisors are human too.
For instance you may have to discount some advice because of the advisor's self-interest. Or, say you are a freshman seeking God's will concerning getting married this summer. But at other times you will need to inflate the value of the advice you get. But a picture is starting to appear. You are narrowing down the decision.