The significant contribution of empiricism was not the eradication of certainty, but the eradication of infallibility as a criterion of certainty. And this shift from infallibilism to fallibilism has profound consequences not only for toleration, but also for the subordination of faith to reason and theology to philosophy.

A willingness to engage in the give and take of argument displays a commitment to cognitive egalitarianism—the proposition that all people should be treated as intellectual equals, and that no individual can legitimately claim a privileged immunity from the burden of proof.

When conformity is required, as it is in Christianity, what are the results? To begin with, the sacrifice of truth inevitably follows. One can be committed to conformity or one can be committed to truth, but not both. The pursuit of truth requires the unrestricted use of one's mind—the moral freedom to question, to examine evidence, to consider opposing viewpoints, to criticize, to accept as true only that which can be demonstrated—regardless whether one's conclusions conform to a particular creed.

Through inculcating the notion that sacrifice is a virtue, Christianity has succeeded in convincing many people that misery incurred through sacrifice is a mark of virtue. Pain becomes the insignia of morality—and conversely, pleasure becomes the insignia of immorality. Christianity, therefore, does not say, ‘Go forth and be miserable.’ Rather, it says, ‘Go forth and practice the virtue of self-sacrifice.’ In practical terms, these commands are identical.

Christianity cannot erase man's need for pleasure, nor can it eradicate the various sources of pleasure. What it can do, however, and what it has been extremely effective in accomplishing, is to inculcate guilt in connection with pleasure. The pursuit of pleasure, when accompanied by guilt, becomes a means of perpetuating chronic guilt, and this serves to reinforce one's dependence on God. ** p. 308

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Intellectually, every man is an island unto himself; no man can assume the responsibility of thinking for another. The virtue of rationality thus entails intellectual independence and the willingness to assume responsibility for one’s beliefs, choices, and actions.

If acorns start growing into theologians, or if women begin turning into pillars of salt, then we may wish to hypothesize about a supernatural influence. But until such time as nature becomes hopelessly unintelligible and unpredictable, we need look no further than nature itself for explanations.

Reason is not one tool of thought among many, it is the entire toolbox. To advocate that reason be discarded in some circumstances is to advocate that thinking be discarded—which leaves one in the position of attempting to do a job after throwing away the required instrument.

There can be no knowledge of what is good for man apart from knowledge of reality and human nature, and there is no manner in which this knowledge can be acquired except through reason. To advocate irrationality is to advocate that which is destructive to human life.

It is my firm conviction that man has nothing to gain, emotionally or otherwise, by adhering to a falsehood, regardless of how comfortable or sacred that falsehood may appear. Anyone who claims, on the one hand, that he is concerned with human welfare, and who demands, on the other hand, that man must suspend or renounce the use of his reason, is contradicting himself.

To enumerate the particular details—the sufficient conditions—of a good society is effectively to prohibit individuality and social change. A planned society, a society in which sufficient conditions are politically determined and coercively imposed, is ‘closed’ to the spontaneous innovations of free association. We see this in the utopian writings of Plato and his many admirers. A utopian society is a perfect society, one that has been carefully designed by a wise and beneficent lawgiver. Any deviation from perfection must necessarily be for the worse, so social change—which in this scheme is but another name for social degeneration—must be arrested at all costs. And this, in turn, requires the suppression of individuality. The individual’s pursuit of happiness—that powerful and unpredictable agent of social change—must be subordinated for the sake of a good society, as specified in the utopian blueprint of sufficient conditions.

A theory of necessary conditions will tend to generate a model of the open society, whereas a theory of necessary and sufficient conditions will tend to generate a model of the closed society. These conflicting models result from the inner logic of ideas. To offer a sketch of what is minimally necessary for a good society is to leave considerable room for diversity, variation, and change. But the available space for individuality will progressively decrease as additional details transform what had been a sketch into a veritable blueprint for the good society.

The academic who lives comfortably in his professional enclave, secure in the belief that his corner of the cognitive world is the entire universe, has little need for philosophy, which he regards as a descent into idle speculation. Philosophy, for this academic, is an irritating enterprise, one that might call into question his most cherished assumptions.