Source: http://www.nytimes.com/2014/04/12/opinio...

The most generous children were those who watched the teacher give but not say anything. Two months later, these children were 31 percent more generous than those who observed the same behavior but also heard it preached. The message from this research is loud and clear: If you don’t model generosity, preaching it may not help in the short run, and in the long run, preaching is less effective than giving while saying nothing at all.

People often believe that character causes action, but when it comes to producing moral children, we need to remember that action also shapes character. As the psychologist Karl Weick is fond of asking, “How can I know who I am until I see what I do? How can I know what I value until I see where I walk?”