Psychology is a science, and teaching is an art; and sciences never generate arts directly out of themselves.
The harder the conflict, the more glorious the triumph.
每一个天使都是可怕的。
We have to continually be jumping off cliffs and developing our wings on the way down.
Dairy farming is both an art and a science—respecting both is essential for success.
成功需要坚持，面对失败不放弃的能力，并从失败中学习。