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1 " That which is true must always remain true, though the applications may change greatly from generation to generation. It is the absence of such fundamental certainties, no doubt, that leads men into continual search for a satisfying religion, or that drives them away from their old religion. "
― , Rational Theology
2 " Of course present knowledge of psychology is nearer to zero than to complete perfection, and its applications to teaching must therefore be often incomplete, indefinite, and insecure. The application of psychology to teaching is more like that of botany and chemistry to farming than like that of physiology and pathology to medicine. Anyone of good sense can farm fairly well without science, and anyone of good sense can teach fairly well without knowing and applying psychology. Still, as the farmer with the knowledge of the applications of botany and chemistry to farming is, other things being equal, more successful than the farmer without it, so the teacher will, other things being equal, be the more successful who can apply psychology, the science of human nature, to the problems of the school. (pp. 9-10) "
― ,
3 " To Nature nothing can be added; from Nature nothing can be taken away; the sum of her energies is constant, and the utmost man can do in the pursuit of physical truth, or in the applications of physical knowledge, is to shift the constituents of the never-varying total. The law of conservation rigidly excludes both creation and annihilation. Waves may change to ripples, and ripples to waves; magnitude may be substituted for number, and number for magnitude; asteroids may aggregate to suns, suns may resolve themselves into florae and faunae, and floras and faunas melt in air: the flux of power is eternally the same. It rolls in music through the ages, and all terrestrial energy—the manifestations of life as well as the display of phenomena—are but the modulations of its rhythm. "
― John Tyndall
4 " There does not exist a category of science to which one can give the name applied science. There are science and the applications of science, bound together as the fruit of the tree which bears it. "
