Substitutable Quotes

This new model of development would be based clearly on the goal of sustainable human well-being. It would use measures of progress that clearly acknowledge this goal. It would acknowledge the importance of ecological sustainability, social fairness, and real economic efficiency. Ecological sustainability implies recognizing that natural and social capital are not infinitely substitutable for built and human capital, and that real biophysical limits exist to the expansion of the market economy. (Robert Costanza)
Science for its part speaks against the special importance of any object of science, including human beings. ... Science as opposed to religion recognizes nothing sacred either outside man or within him. But collectively, science is the assertion of man over non-man, surely an unembarrassed claim to importance and rule. Yet as individuals, scientists are anonymous factors in the scientific enterprise, each one substitutable for another. For all science cares, scientists could as well be numbered as named. View quote
Harvey Mansfield