发明家的职责是使他的工作尽可能对公众有用和可及。
It is the duty of the inventor to make his work as useful and as accessible as possible to the public.
"We are all in the gutter, but some of us are looking at the stars."
The past is never dead. It's not even past.
The secret of getting ahead is getting started.
我不是为了装饰而画画，我是为了交流而画画。