If we want to protect forests, we must first understand them.
I think goals should never be easy, they should force you to work, even if they are uncomfortable at the time.
懒惰奢侈,招来贫困;勤劳节俭,累积财富。
要理解现在,必须挖掘过去。
登上梯子顶端的唯一方法就是一步一步往上爬。
解析:意与知、物紧密相连。