Hermann Ebbinghaus

"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."

"Psychology has a long past, yet its real history is short. For thousands of years it has existed and has been growing older ; but in the earlier part of this period it cannot boast of any continuous p…"

"Mental states of every kind — sensations, feelings, images— which were at one time present in consciousness and then have disappeared from it — have not with their disappearance absolutely ceased to e…"

"Language is a system of conventional signs that can be voluntarily produced at any time."

"No matter how thoroughly a person may have learned the Greek alphabet, he will never be in a condition to repeat it backwards without further training. But if he chances to set out purposely to learn …"

"A poem is learned by heart and then not again repeated. We will suppose that after a half year it has been forgotten: no effort of recollection is able to call it back again into consciousness."

"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…"

"Mental events, it is said, are not passive happenings but the acts of a subject."