Full Idea
To speak of a good person is to speak of an individual not in respect of his body, or of faculties such as sight and memory, but as concerns his rational will (his 'will as controllable by reason').
Gist of Idea
Someone is a good person because of their rational will, not their body or memory
Source
Philippa Foot (Natural Goodness [2001], 5)
Book Reference
Foot,Philippa: 'Natural Goodness' [OUP 2003], p.66
A Reaction
She more or less agrees with Kant that the only truly good moral thing is a good will, though she has plenty of other criticisms of his views.