I have read at many places in Zen literature regarding transmission of dharma from teacher to student. My question is – is this some secret teachings of dharma, which the teacher explicitly tells to a student? If yes, then how can it be like this if there is actually nothing as per Heart Sutra?
Teachings on Dharma, which is teachings on things just as they are, is self-evident, so having it public is ok, but what is this secret transmission from teacher to student?
Is it that for enlightenment to happen, this secret transmission is a pre-requisite and so without having an explicit dedicated physical teacher, is enlightenment not possible?
Any information here please. Thanks.