One can stop spread of disease through a community without being 100% effective in each person who gets the vaccine.

疫苗能够遏制疾病在整个社区中传播,虽然对于每个人来说它并非百分之百有效

耶鲁公开课 - 生物医学工程探索课程节选

The ideal audience for the book," he says "should be the preachers, the gentry, the lawyers, men of affairs, who drawing such water as they find from the book can use it," he says, "to sprinkle the same both from the pulpit and from their conversation upon the people."

他还说，像传教士，贵族，律师，当政者,这样的人就更应该读这本书，因为他们有能力,把从书中汲取的思想认识，通过礼拜或与他人的交谈,有效地传播出去“

耶鲁公开课 - 政治哲学导论课程节选