From DSC:
Below is a great quote from David Koetje, Professor of Biology at Calvin College:

I think teaching and learning are a bit like dancing: We can say that one has to lead and the other has to follow. But in reality, each has to constantly pay close attention to the other. For the dance to be beautiful, both have to practice together diligently. If one dancer tries to do it all, then there’s no dance. It takes two to tango.