Everything serves a purpose. It is up to us to understand those purposes and how they affect knowledge and understanding. From understanding comes wisdom. The deeper the understanding, the closer to attaining true wisdom. The road from understanding to wisdom is long and arduous and filled with the pitfalls of faulty logic and reasoning.
True wisdom is the father of mercy and understanding.
Knowledge begets understanding and understanding is the father of wisdom. Information is useless until it becomes knowledge. Knowledge is like a tool, one may not use all of one's tools at any given time, but at any given time one may have the need to have the tools necessary for any job. But tools or knowledge alone aren't enough. Without understanding, tools are worthless and wisdom is stillborn.