The great art to make a nation happy, and what we call flourishing, consists in giving everybody an opportunity of being employed
 John Maynard Keynes, The General Theory of Employment, Interest and Money (1936). copy citation

Context

“will have the same effect upon a whole nation, and that, for example, the English might be much richer than they are, if they would be as frugal as some of their neighbours. This, I think, is an error. On the contrary, Mandeville concludes: The great art to make a nation happy, and what we call flourishing, consists in giving everybody an opportunity of being employed; which to compass, let a Government's first care be to promote as great a variety of Manufacures, Arts and Handicrafts as human wit can invent; and the second to encourage Agriculture and Fishery in all their branches, that the whole Earth may be forccd to exert itself as well as Man.” source