If you're relentlessly selfish and calculating you would say, the chances that I decide the election are zero, so I'm just not going to bother.

如果你唯利是图,精于算计,你会说,我的投票能够决定选举的概率是零,所以我根本无需投票

耶鲁公开课 - 金融市场课程节选

What this often--What this can be viewed as, as an extended version of selfish gene theory, which is that to the extent you're interconnected with other people you care about them more for purely selfish reasons.

其实我们可以把这个观点视为，自私基因理论的延伸，也就是说根据你和别人,互相联系的程度,你对他人的关心更多是因为自私的原因。

耶鲁公开课 - 心理学导论课程节选

If you blow a scoring opportunity because you're selfish, you know the crowd are going to be baying for you, and you know who is going to be slammed in the paper the next day.

BBC: Ieuan Evans