The union of these two is known as the [causal samadhi], in which state arises a
seed-syllable, from which rays of light emerge, purifying the entire environment of
samsara and the beings within it into the nature of emptiness. One’s mind becomes this seed-syllable, which in turn transforms into the pure appearance of the deity. The mandala is seen as the palace of the deity. The form of the deity is the indivisible appearance of
skilful means and
wisdom. All experience is perceived as the retinue and activity of the deity. As one realizes that all perceptions, sounds and thoughts are the
vajra nature, one rests in this state of vajra dignity.<ref>Sogyal Rinpoche,
The Nine Yanas, published by Zam, pages 13-14.</ref>