Suarez maintains that, though the humanity of Socrates does not differ from that of Plato, yet they do not constitute realiter one and the same humanity; there are as many "formal unities" (in this case, humanities) as there are individuals, and these individuals do not constitute a factual, but only an essential or ideal unity ("ita ut plura individua, quae dicuntur esse ejusdem naturae, non sint unum quid vera entitate quae sit in rebus, sed solum fundamentaliter vel per intellectum").