Resource development must balance economic benefits and ecological protection to achieve sustainable development.

Mental activity is the organism's way of engaging with the world.

预测未来的最好方法就是创造未来。

出自北齐·颜之推《颜氏家训·文章》。书写文章要尊崇“三易”的原则，即文章内容要清晰明了，这是第一项。书写的文字要简单概要，这是第二项。书写的段落要读起来朗朗上口这是第三项。