From The Source and Remedy of the National Difficulties, Deduced from Principles of Political Economy, in a Letter to Lord John Russell (published anonymously and later credited to Charles Dilke, and available online):

[W]here men heretofore laboured twelve hours they would now labour six, and this is national wealth, this is national prosperity… [W]ealth is liberty– liberty to seek recreation–liberty to enjoy life–liberty to improve the mind: it is disposable time, and nothing more.