This is such an insightful quote; learning to listen to what a person does NOT say is so important. Whether it's your spouse, child, family, friend or stranger. It's a key component in consoling the downcast and also evaluating a sermon or teaching. I, for one, when listening to a preacher, listen to hear if he mentions the poor, the downcast and all who have fallen between the cracks; if Jesus found it necessary to stress the importance of the poor and hurting by word and deed, then I find it a necessary that who I choose to sit under recognizes it as well. 

Of course topics on all subjects need to be taught, but even a closing prayer will show a lot.