A Person (n.) is more than the "I"; it is grounded in self-legislation.
The Person (n.) is the being who can represent an 'I' — which lifts man infinitely above every other creature on earth.
A Person (n.) is a thing whose very existence is an end in itself — which is why it limits all arbitrary choice.
A Person (n.) is a rational being whose very nature marks it as an end in itself; irrational beings, having only relative worth as means, are called things.
A Person (n.) is more than an animal and more than a rational being: it is a rational being that can be held accountable.
A Person (n.) is conscious of the numerical identity of itself at different times. The concept of the person is necessarily for practical employment.
A Person (n.) is a subject whose actions can be imputed to him : A subject in possession of freedom and spontaneity, able to act according to principles... whereas a thing is that to which nothing can be imputed. A human being acting in response to inclinations is a thing, as is one used simply as a means to another's ends.