Evolution is a theory of organic change, but it does not imply, as many people assume, that ceaseless flux is the irreducible state of nature and that structure is but a temporary incarnation of the moment. Change is more often a rapid transition between stable states than a continuous transformation at slow and steady rates. We live in a world of structure and legitimate distinction. Species are the units of nature's morphology.
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"A Quahog is a Quahog", p. 213Stephen Jay Gould
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The history of most fossil species includes two features particularly inconsistent with gradualism: 1. Stasis. Most species exhibit no directional change during their tenure on earth. They appear in the fossil record looking much the same as when they disappear; morphological change is usually limited and directionless. 2. Sudden appearance. In any local area, a species does not arise gradually by the steady transformation of its ancestors; it appears all at once and “fully formed.”
Stephen Jay Gould
Throughout all organic nature there is at work a modifying influence of the kind... as the cause, these specific differences: an influence which, though slow in its action, does, in time, if the circumstances demand it, produce marked changes—an influence, which to all appearance, would produce in the millions of years, and under the great varieties of condition which geological records imply, any amount of change.
Herbert Spencer
[A]lthough species may be discrete, they have no immutable essence. Variation is the raw material of evolutionary change. It represents the fundamental reality of nature, not an accident about a created norm. Variation is primary; essences are illusory. Species must be defined as ranges of irreducible variation.
Stephen Jay Gould
Under a cabinet constitution at a sudden emergency this people can choose a ruler for the occasion. It is quite possible and even likely that he would not be ruler before the occasion. The great qualities, the imperious will, the rapid energy, the eager nature fit for a great crisis are not required — are impediments — in common times. A Lord Liverpool is better in everyday politics than a Chatham — a Louis Philippe far better than a Napoleon. By the structure of the world we want, at the sudden occurrence of a grave tempest, to change the helmsman — to replace the pilot of the calm by the pilot of the storm.
Walter Bagehot
Spiritual evolution is the progressive advance of mankind toward a state of things in which the light of ethical perfection shall be reflected from the face of human society; that is, in which all men shall live and move and have their being in mutually promoting the highest life of each and all. It means that the object of social reformation shall not be a mere change in the conditions under which men live, but a change in human nature itself. It means that we shall look forward consciously to the breaking forth of new powers in ourselves, to the release, through our own efforts, of capacities dimly latent in us.
Felix Adler
Gould, Stephen Jay
Govorov, Leonid
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