George Orwell. Down and out in Paris and London (№ 238285)

Depth the nature of language are irrational just like magic, actually it is the same kind of spells. However, an obvious paradox: all the while cursing, wanting to shock and hurt, we say out loud something forbidden (usually from the field of sexual functions), however, firmly fixed as a curse, an expression of reason loses its meaning, which has become a dirty word. The word became dirty due to a certain value, but this value is lost due to the fact that he became a curse. <...> Apparently, this rule is recognized in the language, words take on a magical character, and in its new, special status is not suitable for the expression the ordinary sense.