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10. Untrustworthiness appearing in a child should attract attention to his habits. If he has suddenly become heedless, listless, and forgetful, so that he cannot be depended upon, though previously not so, lay the blame upon solitary indulgence. This vice has a wonderful influence in developing untruthfulness. A child previously honest, under its baneful influence will soon become an inveterate liar.
— JOHN HARVEY KELLOGG