How many things would have appeared incontestable in theory if genius had not proved them wrong in practice.

How many things would have appeared incontestable in theory if genius had not proved them wrong in practice.

如果天才没有在实践中证明他们是错的，那么在理论上有多少事情是无可争辩的呢?

-- Gotthold Ephraim Lessing 莱辛