你不仅对你所说的负责，也对你未说的负责。
The teacher's task is not to implant facts but to place the subject to be learned in front of the learner and, through sympathy, emotion, imagination, and patience, to awaken in the learner the restless drive for answers and insights which enlarge the personal life.
没有真理，只有感知。
The only limit to your impact is your imagination and commitment.
Sustainability is not just a goal, it's a responsibility we owe to the future.