"Among all the many kinds of first love, that which begins in childish companionship is the strongest and most enduring: when passion comes to unite its force to long affection, love is at its spring-tide."

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Pavlov's findings were that some animals learned more quickly if rewarded (by affection, by food, by stroking) each time they showed the right response, while others learned more quickly when the penalty for not learning was a painful stimulus.

— Joost Meerloo