The initiation
The initiation is an act in which the teacher passes the technique onto the student. The technique without the initiation is like a soulless body by itself. In that special moment, the teacher helps to lift the student onto a higher frequency, during which the chakras and the energy channels are purified. The teacher guides the student through the process of percieving the three basic qualities: the sound, the light, and the vibration. It is a moment of consecration by the holy person, the master.
The teachers that have recieved their master's blessing to initiate others can perform the initiations. This tradition of passing over the knowlege has been lasting for centuries.
The initiations are regularly a part of the kriya yoga seminars.