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In philosophy , incorrigibility is a property of a philosophical proposition , which implies that it is necessarily true simply by virtue of being believed .. philosophy. philosophy. proposition. proposition. necessarily true. logical truth. A common example of such a proposition is Rene Descartes ' `` cogito ergo sum '' -LRB- `` I think , therefore I am '' -RRB- .. proposition. proposition. Rene Descartes. Rene Descartes. cogito ergo sum. cogito ergo sum. Johnathan Harrison has argued that `` incorrigible '' may be the wrong term , since it seems to imply -LRB- by the dictionary definition -RRB- a sense that the beliefs can not be changed , which is n't actually true .. In Harrison 's view , the incorrigibility of a proposition actually implies something about the nature of believing -- for example , that one must exist in order to believe -- rather than the nature of the proposition itself .. proposition. proposition. For illustration , consider Descartes '  : I think , therefore I exist -. Stated in incorrigible form , this could be  : `` That I believe that I exist implies that my belief is true '' .. Harrison argues that a belief being true is really only incidental to the matter , that really what the cogito proves is that belief implies existence .. One could equally well say , `` That I believe God exists implies that I exist . ''. or `` That I believe I do not exist implies that my belief is false . ''. -- and these would have the same essential meaning as the cogito .. Charles Raff draws a distinction between three types of incorrigibility  :. Type-1  : It is logically necessary that , when the statement is sincerely made , it is true .. Type-2  : It is necessary that when the statement is believed to be true , it is true .. Type-3  : It is necessary that when the statement is true , it is believed to be true .. Type-2 and type-3 incorrigibility are logical converses , and therefore logically independent .. converses. conversion ( logic ). logically independent. logical independence. Charles Raff argues that introspection is not type-1 incorrigible , but is in fact type-2 and type-3 incorrigible .. introspection. introspection. In law , incorrigibility laws were formerly used against minors to commit them for longer periods of confinement for status offenses , similar to in re Gault 's case in the 1960s. law. law. minors. minor ( law ). in re Gault. in re Gault. than an adult would have been for committing the same crimes .