If everything worth knowing has been known, that knowing cannot be held in the body. If the body has to be held, one has to be ignorant to some extent.
When we try to know and learn every other thing that comes to our reach, our perception level increases and sometimes it reaches to a point where we achieve the idea of almost everything. In such condition, it is difficult to get hold on to our body and our senses.
It is always important to be decisive during the process of getting the knowledge of anything that we have learnt it to an extent and whenever we will get a chance, we will learn furthermore about it because it is not the end of it.