<P> The wisdom of repugnance, or the yuck factor, also known informally as "appeal to disgust", is the belief that an intuitive (or "deep - seated") negative response to some thing, idea, or practice should be interpreted as evidence for the intrinsically harmful or evil character of that thing . Furthermore, it refers to the notion that wisdom may manifest itself in feelings of disgust towards anything which lacks goodness or wisdom, though the feelings or the reasoning of such' wisdom' may not be immediately explicable through reason . </P> <P> The term "wisdom of repugnance" was coined in 1997 by Leon Kass, chairman (2001--2005) of the President's Council on Bioethics, in an article in The New Republic, which was later expanded into a further (2001) article in the same magazine, and also incorporated into his 2002 book Life, Liberty, and the Defense of Dignity . Kass stated that disgust was not an argument per se, but went on to say that "in crucial cases...repugnance is the emotional expression of deep wisdom, beyond reason's power fully to articulate ." </P>

The idea of the wisdom of repugnance is a form of
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