"[Enlightenment, of which the Buddha] said: “It is by nature clear light,” is similar to the sun and space.
It is free from the stains of the adventitious poisons and hindrances to knowledge, the veils of which obscured it [like] a dense sea of clouds.

Buddhahood is permanent, steadfast, and immutable, possessing all the unpolluted buddha qualities.
It is attained on the basis of [two] primordial wisdoms: [one is] free from ideation with regard to phenomena, [the other is] discriminative.

Buddhahood is indivisible, yet can be divided according to its property of [twofold] purity.
[Thus] it has two features, which are abandonment and primordial wisdom, similar to space and the sun.

Luminous clear light is not created.
It is indivisibly manifest [in the nature of beings] and holds all the buddha properties outnumbering the grains of sand in the river Ganges.

By nature not existent, pervasive, and adventitious, the veils of the poisons and of the hindrances to knowledge are described as being similar to a cloud."

Mahāyānottaratantra Śāstra