Wisdom is the product of knowledge and knowledge is often times the product of foolish mistakes.

A butterfly flaps its wings in Africa and changes the weather in California.

Unknowns is the one word answer to your question.

You have your known knowns, your known unknowns and your unknown unknowns.

We have to make decisions every day with known unknowns and unknown unknowns. Philosophy is a body of knowledge that is in built up on trial-and-error over time. Those first trials start for us when history first started. We've been building on them ever since. We still know next to nothing about consciousness. Philosophy today primarily deals with consciousness. Once we've modeled the conscious brain and can completely control and predict human nature then there truly will be no need for philosophy.