Simple can be harder than complex: You have to work hard to get your thinking clean to make it simple.
简单比复杂更难：你必须努力工作，才能让你的思维变得清晰，以便使事情变得简单。
美好的生活不是没有悲伤，而是在痛苦中能促进我们成长的生活。
心灵是一个协调活动的系统。
Old minds are like old horses; you must exercise them if you wish to keep them in working order.