The first reason for my growing disaffection with the traditional methods of philosophy was caused in the main by the conflict, which I felt within m… - Jean Piaget

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The first reason for my growing disaffection with the traditional methods of philosophy was caused in the main by the conflict, which I felt within myself, between the habits of verification of the biologist and the psychologist, and speculative reflection, which constantly tempted me, but which could not possibly be submitted to verification…

Two ever deepening convictions were forced on me … One is that there is a kind of intellectual dishonesty in making assertions in a domain concerned with facts, without a publicly verifiable method of testing, and in formal domains without a logistic one. The other is that sharpest possible distinction should at all times be made between personal improvisations, the dogma of a school or whatever is centered on the self or on a restricted group, and, on the other hand, the domains in which mutual agreement is possible, independently of metaphysical beliefs or of ideologies. …

My second reason for disaffection may well appear odd to pure philosophers. It refers to something which from the psycho-sociological point of view is very significant: this is the surprising dependence of philosophical ideas in relation to social or even political change. … I was very much struck, after the First World War (and still more so after the Second) by the repercussions that the social and political instability then prevailing in Europe had on the intellectual climate, and this naturally led me to doubt the objective and universal value of the philosophical standpoints adopted in such conditions.