On The Origin of Species Quotes

“Though nature grants vast periods of time for the work of natural selection, she does not grant an indefinite period; for as all organic beings are striving, it may be said, to seize on each place in the economy of nature, if any one species does not become modified and improved in a corresponding degree with its competitors, it will soon be exterminated.”
― Charles Darwin, On The Origin of Species

“I look at the term species, as one arbitrarily given for the sake of convenience to a set of individuals closely resembling each other.”
― Sabina Radeva, On The Origin of Species