quote · Words worth keeping
Once intelligent beings achieve technology and the capacity for self-destruction of their species, the selective advantage of intelligence becomes more uncertain.
Once intelligent beings achieve technology and the capacity for self-destruction of their species, the selective advantage of intelligence becomes more uncertain.
Approximate historical placement: c. 1965 AD · modern
Meaning not yet available
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- Author or tradition
- Carl Sagan
Attribution: attributed - Country attributed
- Not established
A country attribution does not establish the earliest origin. - Historical period
- Approximate historical placement: c. 1965 AD · modern
Approximate author-period anchor from life dates 1934 to 1996; Wikidata Q410, https://www.wikidata.org/wiki/Q410 (accessed 2026-10-08). Not a quotation composition date.
An author lifetime or approximate period is not necessarily the date when these words were written or spoken. - Recorded source
- Contributor-provided quotation collection
Supplied reference C; CSV row 101951; supplied attribution, independently unverified
A collection's publication date can be later than the words it records.