The greatest threat to our forests is not the axe, but indifference.
The writer’s life is a life of failure.
A man should always consider how much he has more than he wants.
听到了却没有亲眼见到,即使听得再多,也必有谬误;亲眼见到了却不能理解,即使记得再多,也必有错误;知道了却不去实际践行,就是知识再多,也必然困惑。