…is from page 147 of the excellent new book Arguments for Liberty (edited by Aaron Ross Powell and Grant Babcock). This quote comes from the essay on Contractarianism by Jan Narveson (original emphasis):
Liberalism is exemplified by normative systems that hold two points: (a) that the sole acceptable purpose of rules, laws, and in general interventions must be the good of those intervened upon; and (b) that it is those persons themselves, rather than any supposed authorities, who fundamentally embrace those values. Individuals, then, are the basic holders of the values that interventionist institutions and personages are to respect….Both are essential. So-called liberals of the present day tend to think that they, the pundits or theorists or the elected politicians, know what people want better than the people themselves.