You can't just sit there and wait for people to give you that golden dream. You've got to get out there and make it happen for yourself.

Every tree we plant today is an investment in a greener, healthier tomorrow.

Animals are such agreeable friends―they ask no questions, they pass no criticisms.

最大的悲剧不是坏人的残暴，而是好人的沉默。

The most dangerous poison is the feeling of achievement. The antidote is to think every evening what can be done better tomorrow.

教学的全部艺术，不过是唤醒年轻人天生的好奇心，以便日后满足它。