We need a non-stopping Lineage of the teachings coming from Buddha up to us
There is the mind lineage of the Buddhas, the symbol lineage of the Vidyadharas, and the oral lineage of individuals – these three groups have their own ways of to teach. Buddhas had their own ways of teaching to each other. And Vidyadharas also have their unique way of teaching. And also, ordinary people like us, we have our own way to receive teachings and to teach to others.