Knowing the world, is it useful?

One asked one self whether has some knowledges about the world would be useful for one self. In some field of life, like getting job, helping each other, having a trip, one tough that knowledges about the world would be useful.

But in many more aspect, maybe it is not that essential. Even you cultivated a lot of knowledges till this very moment, but if you can not understand your own self, then the knowledge seems as empty shell of the past.

We'll met a lot of circumstance that our limited knowledges won't be able to resolve it. Than what shall we do? Is there something else so essential in this life except than just knowledge?