Theprincipleismerelythisthatdifferentsubjectsandmodesofstudyshouldbeundertakenbypupilsatfittingtimeswhentheyhavereachedtheproperstageofmentaldevelopment.
You would think that this was obvious, but in some schools and universities we are as far away from that as we can be. Learning is not a treatment to be undergone, yet...
This is the entry point for everyone's oscillating learning wave.