“The relation of repetitions for learning and for repeating English stanzas needs no amplification. These were learned by heart on the first day with less than half of the repetitions necessary for the shortest of the syllable series.”
Source: Memory: A contribution to experimental psychology, 1885, p. 85
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Hermann Ebbinghaus 16
German psychologist 1850–1909Related quotes

The Dark Ages (1968), p. 188
General sources

In Search of Memory (2006)
Context: CREB's opposing regulatory actions provide a threshold for memory storage, presumably to ensure that only important, life-serving experiences are learned. Repeated shocks to the tail are a significant learning experience for an Aplysia, just as, say, practicing the piano or conjugating French verbs are to us: practice makes perfect, repetition is necessary for long-term memory. In principle, however, a highly emotional state... could bypass the normal restraints on long-term memory. In such a situation, enough MAP kinase molecules would be sent into the nucleus rapidly enough to inactivate all of the CREB-2 molecules, thereby making it easy for protein kinase A to activate CREB-1 and put the experience directly into long-term memory.
"Back to the Dump" (p.414)
There's a Country in My Cellar (1990)
Source: Last and First Men (1930), Chapter XV: The Last Men; Section 4, “Cosmology” (p. 229)

"Fifth Talk in Bombay 1950 (12 March 1950) http://www.jkrishnamurti.com/krishnamurti-teachings/view-text.php?tid=352&chid=4672&w=%22Truth+is+not+something+in+the+distance%22, J.Krishnamurti Online, JKO Serial No. 500312, The Collected Works, Vol. VI, p. 134
Posthumous publications, The Collected Works
Context: Truth is not something in the distance; there is no path to it, there is neither your path nor my path; there is no devotional path, there is no path of knowledge or path of action, because truth has no path to it. The moment you have a path to truth, you divide it, because the path is exclusive; and what is exclusive at the very beginning will end in exclusiveness. The man who is following a path can never know truth because he is living in exclusiveness; his means are exclusive, and the means are the end, are not separate from the end. If the means are exclusive, the end is also exclusive. So there is no path to truth, and there are not two truths. Truth is not of the past or the present, it is timeless; the man who quotes the truth of the Buddha, of Shankara, of Christ, or who merely repeats what I am saying, will not find truth, because repetition is not truth. Repetition is a lie.

Interview on Charlie Rose https://archive.org/details/WHUT_20100614_130000_Charlie_Rose (2000)