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Humans are amphibians...half spirit and half animal...as spirits they belong to the eternal world, but as animals they inhabit time. This means that while their spirit can be directed to an eternal object, their bodies, passions, and imaginations are in continual change, for to be in time, means to change. Their nearest approach to constancy, therefore, is undulation--the repeated return to a level from which they repeatedly fall back, a series of troughs and peaks.

Humans are amphibians...half spirit and half animal...as spirits they belong to the eternal world, but as animals they inhabit time. This means that while their spirit can be directed to an eternal object, their bodies, passions, and imaginations are in continual change, for to be in time, means to change. Their nearest approach to constancy, therefore, is undulation--the repeated return to a level from which they repeatedly fall back, a series of troughs and peaks.

Approximate author period: c. 1919 AD · modern

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Attribution & collection notes
Author or tradition
C.S. Lewis
Attribution: attributed
Country attributed
Not established
A country attribution does not establish the earliest origin.
Historical period
Approximate author period: c. 1919 AD · modern
Approximate author-period evidence for C. S. Lewis: documented activity in 1919. Wikidata Q9204, inspected 2026-10-08. Not a quotation composition date or independent verification of attribution. Source: https://www.wikidata.org/wiki/Q9204 (accessed 2026-10-08).
An author lifetime, approximate period or collection date is not necessarily the date when these words were first written or spoken.
Recorded source
Contributor-provided quotation collection

Supplied reference C; CSV row 208431; supplied attribution, independently unverified

A collection's publication date can be later than the words it records.