We must know the very root of knowledge.
We must know why man finds knowledge important.
We must know both, the usefulness and the limitations of the knowledge.
As long as you are taking yourself as lost and stranded, you need knowledge.
And when you are someone who fundamental desire has been quenched, then knowledge is no more that appealing.
You would still have knowledge, but your urge towards knowledge would not be the urge of a dying man, thirsty man towards water.
Now knowledge to you would be like a hobby.