"My brothers and sister and I were brought up in an atmosphere which I would describe as 'Puritan decadence'. Puritanism names the behaviour which is condemned; Puritan decadence regards the name itself as indecent, and pretends that the object behind that name does not exist until it is named."

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It is clear that the building of models is not a purely mechanical process but requires skill of a high order - not merely mathematical skill but a sensitivity to the relative importance of different factors and a critical, almost an artistic, faculty in the selection of behaviour equations which are reasonable, tentative hypotheses in explaining the behaviour of actual economies.

— Kenneth E. Boulding