What is the significance of the CPS Sunday lectures?

There are two kinds of talks - one that revolve problems and issues that exist in the world around us. People sit together to discuss these issues and raise hue and cry about it. It is my understanding that people are already prepared for attending such gatherings and need not be prepared additionally. The other kind is the CPS lectures. In my view, people are not prepared for such lectures. Making a person a prepared mind therefore assumes paramount importance.