Sentence:  It would doubtless be out of place to enter here into any investigation in regard to the origin of our ideas; but I think it will be apparent, that the notion of "continuity" is <WSD>coöriginal</WSD> with that of personal identity, and therefore, antecedent to argumentation[.] 
Meaning of the word marked with <WSD> tags:  (Existing) together "(ab initio)"; (equiprimordial).