In Mao's Selected Works, three common and hazardous learning pitfalls are summarized. The first one is studying for the sake of study itself, losing sight of the true purpose of learning, which is never about the act of learning but to understand the world and fulfill one's needs. Why must we fulfill needs? Because as long as we live, we have needs—they vary widely, like craving a dish of braised pork with preserved vegetables, wishing for a better life for our family, wanting the help of a nanny to launder stinky socks, desiring a better society, or purifying one's heart from desires. Even those who pursue a life free from desires are, in fact, fulfilling a need. People who seem to have no pursuits or needs merely have a narrow understanding of 'needs,' mistakenly associating them solely with basic physiological desires. To the point, since we have needs simply by existing, we must learn in order to better satisfy them. Learning helps us understand the world and leverage that understanding to meet our needs. However, sometimes we learn for the sake of learning, regardless of truth, utility, or harm, and whether it serves our real needs. This approach, detached from the main goal, leads to the second pitfall of learning: restricting the scope of learning. If the first issue is about cramming everything into one's mind, losing the fundamental purpose, then the second is about the limitation of range in learning.