应对不自由世界的唯一方法是变得如此绝对自由，以至于你的存在本身就是一种反叛。

森林的真正价值不能仅用板材英尺来衡量。

The coal industry must evolve to meet modern environmental standards, or it will become obsolete.

The teacher is not in school to impose certain ideas or to form certain habits in the child, but is there as a member of the community to select the influences which shall affect the child and to assist him in properly responding to those influences.