Noun
The doctrine or system of those who deduce their religious opinions from reason or the understanding, as distinct from, or opposed to, revelation.
The system that makes rational power the ultimate test of truth; -- opposed to sensualism, or sensationalism, and empiricism.
Source: Webster's dictionaryIt is impossible to communicate to people who have not experienced it the undefinable menace of total rationalism. Czesław Miłosz
Rationalism is an adventure in the clarification of thought. Alfred North Whitehead
It is amusing to hear the modern Christian telling you how mild and rationalistic Christianity really is and ignoring the fact that all its mildness and rationalism is due to the teaching of men who in their own day were persecuted by all orthodox Christians. Bertrand Russell
Liberalism is Rationalism in politics. Francis Parker Yockey
The rationalism of the creative minds was tempered by abundant fantasies, and the supreme beauty of the monuments was probably spoiled by the circumambient vanities and ugliness; in a few cases the Greeks came as close to perfection as it was possible to do, yet they were human and imperfect. George Sarton
Rationalism doesn't require "belief,” only observation. The real, measurable world doesn't care what you believe. Joe Haldeman