“The schoolboy doesn't force himself to learn his vocabularies and rules altogether at night, but knows that he must impress them again in the morning.”
Source: Memory: A contribution to experimental psychology, 1885, p. 89
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Hermann Ebbinghaus 16
German psychologist 1850–1909Related quotes

“Any schoolboy could see that man as a force must be measured by motion, from a fixed point.”
On the genesis of two of his historical and autobiographical works.
The Education of Henry Adams (1907)
Context: Any schoolboy could see that man as a force must be measured by motion, from a fixed point. Psychology helped here by suggesting a unit — the point of history when man held the highest idea of himself as a unit in a unified universe. Eight or ten years of study had led Adams to think he might use the century 1150-1250, expressed in Amiens Cathedral and the Works of Thomas Aquinas, as the unit from which he might measure motion down to his own time, without assuming anything as true or untrue, except relation. The movement might be studied at once in philosophy and mechanics. Setting himself to the task, he began a volume which he mentally knew as "Mont-Saint-Michel and Chartres: a Study of Thirteenth-Century Unity." From that point he proposed to fix a position for himself, which he could label: "The Education of Henry Adams: a Study of Twentieth-Century Multiplicity." With the help of these two points of relation, he hoped to project his lines forward and backward indefinitely, subject to correction from any one who should know better. Thereupon, he sailed for home.

1850s, Speech at Peoria, Illinois (1854)
Context: Judge Douglas frequently, with bitter irony and sarcasm, paraphrases our argument by saying: "The white people of Nebraska are good enough to govern themselves, but they are not good enough to govern a few miserable negroes!"
Well! I doubt not that the people of Nebraska are and will continue to be as good as the average of people elsewhere. I do not say the contrary. What I do say is that no man is good enough to govern another man without that other's consent. I say this is the leading principle, the sheet-anchor of American republicanism. Our Declaration of Independence says: "We hold these truths to be self-evident: That all men are created equal; that they are endowed by their Creator with certain inalienable rights; that among these are life, liberty and the pursuit of happiness. That to secure these rights, governments are instituted among men, deriving their just powers from the consent of the governed."
I have quoted so much at this time merely to show that, according to our ancient faith, the just powers of governments are derived from the consent of the governed. Now the relation of master and slave is pro tanto a total violation of this principle. The master not only governs the slave without his consent, but he governs him by a set of rules altogether different from those which he prescribes for himself. Allow ALL the governed an equal voice in the government, and that, and that only, is self-government.
"The Individual and Political Life of Information Systems", in Heilprin, Markuson, and Goodman, ed., Proceedings of the Symposium on Education for Information Science, Warrenton, Virginia, September 7-10, 1965 (Washington, DC: Spartan Books, 1965)

“To Whom the Mornings stand for Nights,
What must the Midnights — be!”
1095: To Whom the Mornings stand for Nights,
The Complete Poems of Emily Dickinson (1960)