This world, the world beyond, are well explained by the one who knows, One that is accessible to Marā, and one that is not accessible to death.
By the All-awakened One, foreknowing, thoroughly knowing every world, Opened is the door of the Deathless; when Nirvana has been reached there is security.
Cutting across the stream of the Evil One, shattering and destroying it, Let there be abundant delight, monks, let security be reached.
Source: The Living Thoughts of Gotama the Buddha by Ananda Coomeraswamy
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