By these acts Leto II removed himself from the evolutionary succession.
He did it with a deliberate cutting action, saying: "To be independent is to be
removed." Both twins saw beyond the needs of memory as a measuring process,
that is, a way of determining their distance from their human origins. But it
was left to Leto II to do the audacious thing, recognizing that a real creation
is independent of its creator. He refused to reenact the evolutionary sequence,
saying, "That, too, takes me farther and farther from humanity." He saw the
implications in this: that there can be no truly closed systems in life.

-- The Holy Metamorphosis, by Harq al-Ada
--[children-of-dune]--