In Mahāyānottara-tantra it is said: The clear light of mind And the nature of it is unchangeable like the sky. There is no difference between the continuation of Buddha’s nature and the mind of the sentient beings. The nature of the mind in itself is the Dharmakāya, spontaneously existing with our mind. But being covered with defilements, we fail to recognize the reality of our mind. When we realize the nature of Buddha, we visualize the nature of the Dharmakāya.