古之学者为己（所谓为己之学），今之学者为人。
【讲解】：古代读书人学习的目的，在于修养自己的学问道德（然后去为国家、人民服务），现在读书人学习的目的，在于给别人看（希望得到别人的赞美和任用）。
用度少，则金价低贱；金价贱，则事情难成。
The key to managing complexity is to focus on the interfaces between components, not their implementations.
The more experienced I get, the more I understand that it’s not about perfection – it’s about progression.
可持续性不再是可选项，而是我们前进的唯一道路。
The energy sector must lead by example in the fight against climate change.
The world is full of doors, and every door is a choice.