每日原则：​自然的一项根本法则是，为了赢得力量，人必须努力突破极限

正如卡尔·荣格所说，“人需要困难，这对健康来说是必需的”。但多数人本能地躲避痛苦。不论是锻炼身体还是头脑，人都会躲避痛苦，如举重的痛苦，如受挫、思想挣扎、尴尬、耻辱的痛苦。当人们面对“自身存在不完美”这个残酷现实时，这一点就体现得更明显了。

As Carl Jung put it, “Man needs difficulties. They are necessary for health.” Yet most people instinctually avoid pain. This is true whether we are talking about building the body (e.g., weight lifting) or the mind (e.g., frustration, mental struggle, embarrassment, shame)—and especially true when people confront the harsh reality of their own imperfections.