Wisdom

Introduction
It is very important in life to know things, such as Mathematics, Language, Social Interactions, etc. However, knowing things is merely not enough. What good is knowing of a pen, and not knowing what to do with it. Knowledge alone is dangerous. Knowledge alone can lead to ethical and moral problems. Say thou know how to fight very well; all correct, what can this knowledge of fighting lead thee to do? Yes, it can help thee fight off imposing threats but it can also lead thee to fight anyone for any reason; even no reason at all. Knowledge alone, is dangerous. The key that is missing is knowing what to do with that knowledge. This, we call Wisdom.
Wise
According to the Oxford dictionary, Wisdom is "The ability to make sensible decisions and give good advice because of the experience and knowledge that you have". A person may have all of the knowledge in The World, and yet, if they do not acquire antiquate wisdom, all of their knowledge will be either useless or outright disastrous to all who are affected by their decisions.  Here's another example: Say there is a person who has a collegiate or professional level of reading skills. This well-educated person wants to become an expert in Classical Literature. Now say this person does not even know what is considered classical literature; so they spends all day reading contemporary works that do not even mention nor reference The Classics. Will this well read man know anything of The Iliad? Gilgamesh? Beowulf? Etc? It is very unlikely at this point. What was this person missing? They were missing the knowledge of what books were The Classics, and those that were not. They lacked the wisdom to know these things and so their intentions were not accomplished. Knowing what to do with what ye knowledge, is Wisdom.