唯一的限制是你自己设定的。
There is no better teacher than history in determining the future……There are answers worth billions of dollars in a history book.
解读：这是诙谐调侃，意在缓解人们自我否定时的低落情绪，用幽默方式鼓励换个视角看自己，重拾轻松心态。
获得智慧是一种道德责任，它不仅仅是为了让你们的生活变得更加美好。有一个相关的道理非常重要，那就是你们必须坚持终身学习。如果不终身学习，你们将不会取得很高的成就。光靠已有的知识，你们在生活中走不了多远。
Wisdom acquisition is a moral duty. It’s not something you do just to advance in life. And there’s a corollary to that proposition which is very important. It means that you’re hooked for lifetime learning, and without lifetime learning you people are not going to do very well. You are not going to get very far in life based on what you already know.