Hermann Ebbinghaus

Series of syllables which have been learned by heart, forgotten, and learned anew must be similar as to their inner conditions at the times when they can be recited.
Series of syllables which have been learned by heart, forgotten, and learned anew must be similar as to their inner conditions at the times when they can be recited.
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anew  condition  forget  

These are some quotes by German author Hermann Ebbinghaus Psychologist, who lived between January 24, 1850 and February 26, 1909.