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1 " When what we introduce into the children's world of ideas and feelings is in line with the direction of the developmental forces of a given stage of life, we strengthen the entire developing person in a way that remains a source of strength throughout that person's life. "
2 " Learning certain things purely through memory is related to the developmental forces that are present between the sixth or seventh year and the fourteenth year of life. This quality of human nature is what mathematical instruction should be based on. "
