boethius' definition the catholic encyclopedia refers to boethius definition of person natur rationalis individua substantia an individual substance of a rational nature as the classic definition one on which they elaborate as a basis for further treatment they get into trinitarianism actually i have to admit its a good definition person ultimately has something to do with rationality an individual something of a rational nature i know you've been doing a lot of good work here pfhorrest what do you think t c