"This understanding, underlying constitutional interpretation since the New Deal, reflects the Constitution's demands for structural flexibility sufficient to adapt substantive laws and institutions to rapidly changing social, economic, and technological conditions."

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Living political constitutions must be Darwinian in structure and in practice. Society is a living organism and must obey the laws of life, not of mechanics; it must develop. All that progressives ask or desire is permission-in an era when 'development,' 'evolution,' is the scientific word-to interpret the Constitution according to the Darwinian principle; all they ask is recognition of the fact that a nation is a living thing and not a machine.

— Woodrow Wilson