A healthy forest is a resilient forest.

We have not yet learned to think, but we are learning.

The question of truth and falsehood is always present, but it is not always answerable.

解释：阻塞老百姓的嘴，好比阻塞河水。河流如果堵塞后一旦再决堤，伤人一定很多，人民也是这样。不可堵塞民众的言论，不给他们发表自己想法的机会。如这样去做，将比堵塞江河带来的后果更严重。