A person is what he thinks

"Aside from whatever objections will be immediately raised against this uncommon conclusions, theologians will complain that this reduces the Trinity to one Person because, being omniscient, they all have, or are, the same complex. This objection is based on a blindness toward certain definite Scriptural information. I am not at the moment referring only to the eternal generation of the Son and the eternal procession of the Spirit. I am referring to the complex of truths that form the Three Persons. Though they are equally omniscient, they do not all know the same truths. Neither the complex of truths we call the Father nor those we call the Spirit has the proposition, 'I was incarnated.' This proposition occurs only in the Son's complex. Other examples are implied. The Father cannot say, 'I walked from Jerusalem to Jericho.' Nor can the Spirit say, 'I begot the Son.' Hence the Godhead consists of three Persons, each omniscient without having precisely the same content. If this be so, no difficulty can arise as to the distinctiveness of human persons. Each one is an individual complex. Each one is his mind or soul. Whether the propositions be true or false, a person is the propositions he thinks. I hope that some think substance to be a subterfuge." -Gordon H. Clark, Incarnation, Pg. 54-55