"If, at the moment the energy of the base manifests, one does not consider it something different than oneself and one recognizes one's own state as indivisibility of essence, nature, and potentiality of energy, the movement of energy self-liberates.
Understanding the essence that is the very nature of primordial enlightened intent, one finds oneself always in this state: this is called Samanthabadra or Immutable Light, this itself is the Primordial Lord, perfect in his original condition... Without color or form, beyond the limit of size, transcending the duality of abode and of someone dwelling therein, it is the immutable nature of the fourth time, beyond past, present, and future, the infinite space of self-perfection endowed with the five perfect conditions for the transmission of knowledge until the end of time.
This is the pure dharmakaya dimension, the essence of the vajra of clear light, that also contains the dimensions of sambhogakaya and nirmanakaya."
From the primary Dzogchen Tantra, Kunjed Gyalpo, ChNN