In everything， there is a limit beyond which we cannot go.

"The only limit to our realization of tomorrow will be our doubts of today."

把无知视为对自由的限制，理由在于它使人做出若看清后果便不会做出的选择。

可持续捕捞不是一种选择——如果我们想保护海洋生物，这是唯一的前进道路。