The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants.

Stories you read when you're the right age never quite leave you. You may forget who wrote them or what the story was called. Sometimes you'll forget precisely what happened, but if a story touches you it will stay with you, haunting the places in your mind that you rarely ever visit.

Leadership is the art of getting someone else to do something you want done because he wants to do it.

It's not the tools you have faith in – tools are just tools – they work， or they don't work.It's people you have faith in or not.

能源的真实成本必须同时考虑其生产和遗留影响。