[1] In his commentary, Pema Karpo says that the clear light is experienced briefly by all human beings at the very first moment of death, by advanced yogic practitioners in the highest states of meditation, and unceasingly by all Buddhas.
The Indian tantric commentator Indrabhuti, in his Jñanasiddhi, states that Being luminous by nature, this mind is similar to the moon’s disc.
Just as the moon becomes fully visible, once it is freed from the accidental obscurities, in the same way the mind-jewel, being pure by nature (prakṛti-pariśuddha), once separated from the stains of defilements (kleśa), appears as the perfected buddha-qualities (guṇa).
Tilopa's oral instructions state: All animate and inanimate things of the three worlds are like the examples of an illusion, a dream and so forth.
[12] In a second phase of this practice, a yogi hangs a picture of his chosen deity behind them so that its image appears in a mirror placed in front.
[11] In the Gelug system, to give rise to the illusory body, one must first practice the previous dharmas of generation stage, inner heat, karmamudra, and radiance yoga.
One begins by practicing inner heat and karmamudra, then going through the stages of the dissolution of the elements, and meditating until radiance and the four blisses arise.