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Negative Quotes

A positive mind finds a way it can be done; a negative mind looks for all the ways it can't be done.

Napoleon Hill (1997). “Napoleon Hill's Positive Action Plan: 365 Meditations For Making Each Day a Success”, p.115, Penguin

Research programmes, besides their negative heuristic, are also characterized by their positive heuristic.

Imre Lakatos, John Worrall, Gregory Currie (1980). “The Methodology of Scientific Research Programmes: Volume 1: Philosophical Papers”, p.49, Cambridge University Press