That axiom of Metaphysicians which is termed the principle of contradiction and which affirms that it is impossible for anything to possess a quality, and in the same time not to possess it, is a consequence of the fundamental law of thought, whose expression is x²=x. (George Boole)

That axiom of Metaphysicians which is termed the principle of contradiction and which affirms that it is impossible for anything to possess a quality, and in the same time not to possess it, is a consequence of the fundamental law of thought, whose expression is x²=x.

George Boole

Related topics

anything axiom consequence contradiction expression fundamental impossible law principle quality thought time

Related quotes

Another great evil arising from this desire to be thought rich; or rather, from the desire not to be thought poor, is the destructive thing which has been honored by the name of "speculation"; but which ought to be called Gambling.

William Cobbett

They wonder much to hear that gold, which in itself is so useless a thing, should be everywhere so much esteemed, that even men for whom it was made, and by whom it has its value, should yet be thought of less value than it is.

Thomas More

A person cannot choose the time in which he is born or lives; it is not up to him, who his parents are, or the nation he will be born into, but what he is responsible for is how he will act in that given time: will he be human or inhuman.

Pavle (Serbian)

There has been an inversion in the hierarchy of the two principles of antiquity, "Take care of yourself” and "Know yourself.” In Greco-Roman culture, knowledge of oneself appeared as the consequence of the care of the self. In the modern world, knowledge of oneself constitutes the fundamental principle.

Michel Foucault

Since only an individual man can possess rights, the expression "individual rights” is a redundancy (which one has to use for purposes of clarification in today's intellectual chaos). But the expression "collective rights” is a contradiction in terms.

Ayn Rand