The first line of Tilopa’s teaching: "I prostrate to the glorious Vajra dakini".  Vajra refers to method. Dakini is prajña. Dakini means sky goers, that  is, emptiness, the base of all phenomena. It doesn’t refer to the  female. Dakini is emptiness, Vajra is the means, unchanging and  indestructible. In these 2 words are included all of ground path and fruition. The Ganges Mahāmudrā teaches the way it is. The first verse: The pledge to give the pith instruction Intelligent Naropa, who endures hardship, Respects the guru and bears suffering. You who are fortunate, take this to heart. The vessel or disciple has to have 4 qualities. Endure hardship for the sake of dharma. Courage and fortitude to rest in equipoise Respect the guru see him as the buddha Bear suffering Intelligence. Prajña is the main attribute. We have to recognise the afflictions.  By the power of prajña we can understand the nature of things as they  are. Understanding develops faith. If we don’t know this, it’s like  torturing ourselves. We need it to pacify our afflictions, our thoughts.  We need prajña to develop enthusiasm for enduring hardship, which leads  to respect for the guru.