The notion that all phenomena are without self nature and illusory like dreams has been extensively elucidated in the Chan Buddhist scripture The Platform Sutra of the Sixth Patriarch and various Vajrayana tantras, particularly in Dzogchen. There is a chapter in Ratnakuta Sutra on the discussion between Kasyapa and Sakyamuni Buddha, which is missing in the Chinese translation of the Sutra but available in the Tibetan version. Kasyapa asked the Buddha what mind is like. The Buddha told him that mind of the past has gone, that of the future not yet born; neither exists. And mind of the present is emptiness, not existent either. Even though this is a Mahayana sutra, the explanation is incisive and crystal clear. It is also said in the Diamond Sutra, “Mind of the past is unobtainable; mind of the present is unobtainable; mind of the future is unobtainable.” When the fifth patriarch of Chan Buddhism said this, Huineng, the sixth patriarch, instantly realized that mind does not exist. If one can suddenly come to this realization, all the heartbreaks from falling out of love and divorce are worth it.
~ Depicted from "THE HANDBOOK FOR LIFE"S JOURNEY : On The Three Poisons - How to Handle Desire"