Full Idea
Liberty was essential, not only as a means to equality, but as part of it. …because the opportunity which was to be equalised was not merely to have and to be happy, but to do and to realise. It was 'the right of man to make the best of himself'.
Gist of Idea
Equality also implies liberty, because equality must be of opportunity as well as possessions
Source
T.H. Green (Lectures on the Principles of Political Obligation [1882]), quoted by John H. Muirhead - The Service of the State IV
Book Reference
Muirhead,John H.: 'The Service of the State: T.H. Green' [John Murray 2021], p.84
A Reaction
This nicely identifies the core idea of civilised liberalism (as opposed to the crazy self-seeking kind). I think 'give people the right to make the best of themselves' makes a good slogan, because it implies ensuring that they have the means.