You can be passive if it isn't any good but if you are more active, you may find things.

如果没有什么好处，你们可以被动,但是如果你们更主动，会发现些什么。

麻省理工公开课 - 电影哲学课程节选

As a matter of fact,if things were perfectly efficiently priced, there wouldn't be any opportunity to generate excess returns and if you make active bets--if you make bets against the market -then whether you win or lose has to do with luck.

事实上,如果资产都是有效定价的,那么根本不可能获得任何超额收益,如果你主动一搏,要从市场中获利,那么无论得失都只能靠运气了

耶鲁公开课 - 金融市场课程节选