Famous quotes containing the words theory, natural and/or selection:
“A theory if you hold it hard enough
And long enough gets rated as a creed....”
—Robert Frost (1874–1963)
“Of all natural forces, vitality is the incommunicable one.... Vitality never “takes.” You have it or you haven’t it, like health or brown eyes or a baritone voice.”
—F. Scott Fitzgerald (1896–1940)
“The books for young people say a great deal about the selection of Friends; it is because they really have nothing to say about Friends. They mean associates and confidants merely.”
—Henry David Thoreau (1817–1862)