"Science can be divided into an infinite number of disciplines, and the amount of knowledge that can be pursued in each discipline is limitless. The most critical piece of knowledge, then, is the knowledge of what is essential to learn and what isn’t. A huge amount of knowledge is accumulated at present. Soon our abilities will be too weak, and our lives too short, to study this knowledge. We have vast treasures of knowledge at our disposal but after we study them, we often do not use them at all. It would be better not to have this burden, this unnecessary knowledge, which we do not really need."