Cora May Williams, A Review of the Systems of Ethics Founded on the Theory of Evolution
“ The law of Identity expresses, therefore, not entire sameness, with which the cessation of all thought would be reached, but simple consistency. It affords us, thus, the means of recognizing the Untrue in that which is not what it is called, hence also the means of recognizing the True. The law of Excluded Middle contains an extension or doubling of the law of Identity, in that the identity here appears, not in the form of consistency, but in that of contradiction ”
