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An educated memory depends on an organized system of associations; and its goodness depends on two of their peculiarities: first, on the persistency of the associations; and, second, on their number.

William James (2008). “Talks to Teachers on Psychology: And to Students on Some of Life's Ideals”, p.96, Nuvision Pubns
An educated memory depends on an organized system of associations; and its goodness depends on two of their peculiarities: first, on the persistency of the associations; and, second, on their number.