We may understand why the species of the same genus, or genera of the same family, resemble each other more nearly in their embryonic than in their more fully developed state, or how it is that in the eyes of most naturalists the structure of the embryo is even more important in classification than that of the adult, 'for the embryo is the animal in its less modified state, and in so far it reveals the structure of its progenitor. In two groups of animals, however much they may at present differ from each other in structure and habits, if they pass through the same or similar embryonic stages, we may feel assured that they have both descended from the same or nearly similar parents, and are therefore in that degree closely related. Thus community in embryonic structure reveals community of descent, however much the structure of the adult may have been modified.
Charles LyellRelated topics
adult animal classification degree embryo family far genus less modified pass present progenitor state thus eyesRelated quotes
We do not inhabit a perfected world where natural selection ruthlessly scrutinizes all organic structures and then molds them for optimal utility. Organisms inherit a body form and a style of embryonic development; these impose constraints upon future change and adaptation. In many cases, evolutionary pathways reflect inherited patterns more than current environmental demands. These inheritances constrain, but they also provide opportunity. A potentially minor genetic change [...] entails a host of complex, nonadaptive consequences. [...] What "play” would evolution have if each structure were built for a restricted purpose and could be used for nothing else? How could humans learn to write if our brain had not evolved for hunting, social cohesion, or whatever, and could not transcend the adaptive boundaries of its original purpose?
Stephen Jay Gould
Can anyone with intelligence really believe that a child born today should be doomed because the snake tempted Eve and Eve tempted Adam? To believe that is not God-worship; it is devil-worship.
Can anyone call this scheme of creation and damnation moral? It defies every principle of morality, as man conceives morality. Can anyone believe today that the whole world was destroyed by flood, save only Noah and his family and a male and female of each species of animal that entered the Ark? There are almost a million species of insects alone. How did Noah match these up and make sure of getting male and female to reproduce life in the world after the flood had spent its force? And why should all the lower animals have been destroyed? Were they included in the sinning of man? This is a story which could not beguile a fairly bright child of five years of age today.
Clarence Darrow
There is an idea, which is not without its advocates, that a vigorous Executive is inconsistent with the genius of republican government. The enlightened well-wishers to this species of government must at least hope that the supposition is destitute of foundation; since they can never admit its truth, without at the same time admitting the condemnation of their own principles. Energy in the Executive is a leading character in the definition of good government. It is essential to the protection of the community against foreign attacks; it is not less essential to the steady administration of the laws; to the protection of property against those irregular and high-handed combinations which sometimes interrupt the ordinary course of justice; to the security of liberty against the enterprises and assaults of ambition, of faction, and of anarchy.
Alexander Hamilton
Humans can be literally poisoned by false ideas and false teachings. Many people have a just horror at the thought of putting poison into tea or coffee, but seem unable to realize that, when they teach false ideas and false doctrines, they are poisoning the time-binding capacity of their fellow men and women. One has to stop and think! There is nothing mystical about the fact that ideas and words are energies which powerfully affect the physico-chemical base of our time-binding activities. Humans are thus made untrue to "human nature." ... The conception of man as a mixture of animal and supernatural has for ages kept human beings under the deadly spell of the suggestion that, animal selfishness and animal greediness are their essential character, and the spell has operated to suppress their REAL HUMAN NATURE and to prevent it from expressing itself naturally and freely.
Alfred Korzybski
With very slight straining of equivalents, Thomas might now be written thus:-
By the term God, is meant a Prime Mover which supplies all energy to the universe, and acts directly on man as well as on all other creatures, moving him as a mechanical motor might do; but man, being specially provided with an organism more complex than the organisms of other creatures, enjoys an exceptional capacity for reflex action,- a power of reflexion,- which enables him within certain limits to choose between paths; and this singular capacity is called free choice or free-will. Of course, the reflexion is not choice, and though a man's mind reflected as perfectly as the facets of a lighthouse lantern, it would never reach a choice without an energy which impels it to act. [...]
The scheme seems to differ little, and unwillingly, from a system of dynamics as modern as the dynamo.
Henry Adams