Nature contains no one constant form.

With respect to those who may ask why Nature does not produce new beings? We may enquire of them in turn, upon what foundation they suppose this fact? What it is that authorizes them to believe this sterility in Nature? Know they if, in the various combinations which she is every instant forming, Nature be not occupied in producing new beings, without the cognizance of these observers? Who has informed them that this Nature is not actually assembling, in her immense elaboratory, the elements suitable to bring to light, generations entirely new, that will have nothing in common with those of the species at present existing? What absurdity then, or what want of just inference would there be, to imagine that the man, the horse, the fish, the bird will be no more? Are these animals so indispensably requisite to Nature, that without them she cannot continue her eternal course? Does not all change around us? Do we not ourselves change? ... Nature contains no one constant form.

Notes:

It has the propensity to produce new forms, not just what we see today.

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Epistemology (0.863058): dbpedia | freebase | opencyc
Time (0.830182): dbpedia | freebase | opencyc
2002 albums (0.827036): dbpedia
Theory of Forms (0.780200): dbpedia | freebase
Present (0.779611): dbpedia | freebase | opencyc
Horse (0.757109): dbpedia | freebase | opencyc
2000 albums (0.751637): dbpedia

 The system of nature
Books, Brochures, and Chapters>Book:  Holbach, Paul Henri Thiry (1795), The system of nature, Retrieved on 2012-06-05
  • Source Material [books.google.com]
  • Folksonomies: philosophy