"Actions spoke louder than words. When the adult behaved selfishly, children followed suit. The words didn’t make much difference — children gave fewer tokens after observing the adult’s selfish actions, regardless of whether the adult verbally advocated selfishness or generosity. When the adult acted generously, students gave the same amount whether generosity was preached or not — they donated 85 percent more than the norm in both cases. When the adult preached selfishness, even after the adult acted generously, the students still gave 49 percent more than the norm. Children learn generosity not by listening to what their role models say, but by observing what they do."
Raising a Moral Child (by Adam Grant)