Famous quotes containing the words scientific and/or theories:
“Bad times have a scientific value. These are occasions a good learner would not miss.”
—Ralph Waldo Emerson (1803–1882)
“The two most far-reaching critical theories at the beginning of the latest phase of industrial society were those of Marx and Freud. Marx showed the moving powers and the conflicts in the social-historical process. Freud aimed at the critical uncovering of the inner conflicts. Both worked for the liberation of man, even though Marx’s concept was more comprehensive and less time-bound than Freud’s.”
—Erich Fromm (1900–1980)