"Gratitude is a vaccine, an antitoxin, and an antiseptic. This is a most searching and true diagnosis. Gratitude can be a vaccine that can prevent the invasion of a disgruntled attitude. As antitoxins prevent the disastrous effects of certain poisons and diseases, thanksgiving destroys the poison of faultfinding and grumbling. When trouble has smitten us, a spirit of thanksgiving is a soothing antiseptic."

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Our purpose is to be able to measure the intellectual capacity of a child who is brought to us in order to know whether he is normal or retarded. ... We do not attempt to establish or prepare a prognosis and we leave unanswered the question of whether this retardation is curable, or even improveable. We shall limit ourselves to ascertaining the truth in regard to his present mental state.

— Alfred Binet