"With the arising of the mind, all things arise; with the ceasing of the mind, all things cease. Everything in the world is only a reflection of the mind."
Like the skull water you drank sweetly thinking it was pure water, what 'object of attachment' brought you great joy yesterday but pain today?
The realization of cool skull water drunk in the night
Wonhyo was a high monk of Silla who set out for Tang Dynasty to study. Seeking refuge from a rainstorm, he fell asleep inside a cave.
Feeling extremely thirsty in the middle of the night, he groped in the dark and drank a sweet, cool water. Opening his eyes in the morning, he realized the water was not from a clean bowl, but rotten rainwater collected inside a human skull, making him vomit. At that moment, he realized: 'The water was sweet last night but filthy this morning only because my mind interpreted it that way!'