Certification schemes are the floor, not the ceiling of responsible forestry practice.

The will to learn is an intrinsic motive, one that finds both its source and its reward in its own exercise.

教育必须基于儿童的心理发展，而不是教育者的任意意志。

解释：凡是法令的贯彻，必须使君主所亲近的人遵守，然后，法令才能贯彻下去。

数学是理性的音乐。