The economic prerequisites for the socialist revolution are fully matured in the US. The political premises are likewise far more advanced than might appear on the surface. James P. Cannon
The nineteenth-century liberal regarded an extension of freedom as the most effective way to promote welfare and equality; the twentieth-century liberal regards welfare and equality as either prerequisites of or alternatives to freedom. Milton Friedman
Men whose research is based on shared paradigms are committed to the same rules and standards for scientific practice. That commitment and the apparent consensus it produces are prerequisites for normal science, i. e., for the genesis and continuation of a particular research tradition. Thomas Samuel Kuhn
Worthiness doesn't have prerequisites. Brené Brown
After all, the universe required ten billion years of evolution before life was even possible; the evolution of the stars and the evolving of new chemical elements in the nuclear furnaces of the stars were indispensable prerequisites for the generation of life. John Polkinghorne
It is heartening to be able to end a textbook that has no prerequisites with a problem that has not yet been solved. Irving Copi