Chainsaws don't destroy forests—short-term thinking does.
Happiness ain't a thing in itself --- it's only a contrast with something that ain't pleasant. That's all it is.
学习在于改变介于刺激和反应之间的某些中介过程。
All the choir of heaven and furniture of earth - in a word, all those bodies which compose the frame of the world - have not any subsistence without a mind.
Sustainability isn't a trend—it's a responsibility we owe to future generations.