Suppose an oil lamp depended on oil and a wick to burn. As the oil and the wick are used up, it would be extinguished due to not being fed. In the same way, feeling the end of the body draw close, they understand: ‘I feel the end of the body draw close.’ Feeling the end of life draw close, they understand: ‘I feel the end of life draw close.’ They understand: ‘When my body breaks up and my life has come to an end, everything that’s felt, since I no longer take pleasure in it, will become cool right here.’”
Linked Discourses 54.9 1. One Thing At Vesālī
So I have heard. At one time the Buddha was staying near Vesālī, at the Great Wood, in the hall with the peaked roof. Now at that time the Buddha spoke in many ways to the mendicants about the meditation on ugliness. He praised the meditation on ugliness and its development.
Then the Buddha said to the mendicants, “Mendicants, I wish to go on retreat for a fortnight. No-one should approach me, except the one who brings my almsfood.” “Yes, sir,” replied those mendicants. And no-one approached him, except the one who brought the almsfood.
Then those mendicants thought, “The Buddha spoke in many ways about the meditation on ugliness. He praised the meditation on ugliness and its development.” They committed themselves to developing the many different facets of the meditation on ugliness. Becoming horrified, repelled, and disgusted with this body, they looked for a suicide weapon. Each day ten, twenty, or thirty mendicants committed suicide.