Full Idea
Supporters of equality have asserted that people are alike in certain things they could do or achieve, as well as in the things that they need and could suffer.
Gist of Idea
Equality implies that people are alike in potential as well as in needs
Source
Bernard Williams (The Idea of Equality [1962], §2)
Book Reference
Williams,Bernard: 'Problems of the Self: Papers 1956-1972' [CUP 1979], p.234