“ If a man has worked too hard or through too long hours he gets into a mental state that invites accidents. ”
 Henry Ford, My Life and Work (1922). copy citation

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“The dark corners which invite expectoration are painted white. One cannot have morale without cleanliness. We tolerate makeshift cleanliness no more than makeshift methods. No reason exists why factory work should be dangerous. If a man has worked too hard or through too long hours he gets into a mental state that invites accidents. Part of the work of preventing accidents is to avoid this mental state; part is to prevent carelessness, and part is to make machinery absolutely fool-proof. The principal causes of accidents as they are grouped by the experts are:” source