"The way I see it,having recovered with the help of the American government and the American taxpayer, our banks now have a greater obligation to the goal of a wider recovery,"

VOA: standard.2009.12.20

The universities are the fountains of civil and moral doctrine and have the obligation to teach the correct doctrine of rights and duties."

大学是公民权力和道德学说的理论源泉,而且它的义务也即是把正确的,权利义务学说教授给公众“

耶鲁公开课 - 政治哲学导论课程节选

And I conclude that we do have an obligation, to give significantly to help the world's poor.

我认为，我们的确有责任，慷慨地捐赠，来帮助世界上的贫困人口。

普林斯顿公开课 - 人性课程节选