Ideas which have been developed simultaneously or in immediate success — Hermann Ebbinghaus

"Natural science served as - if we overlook the hasty identification of mind and matter which had its origin in natural science - as a shining and fruitful example to psychology."

"The foreseeing of our attention is the will to give attention, is voluntary attention."

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

"When we read how one mediæval saint stood erect in his cell for a week without sleep or food, merely chewing a plantain-leaf out of humility, so as not to be too perfect; how another remained all night up to his neck in a pond that was freezing over; and how others still performed for the glory of God feats no less tasking to their energies, we are inclined to think, that, with the gods of yore, the men, too, have departed, and that the earth is handed over to a race whose will has become as feeble as its faith."

"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."

"The constant flux and caprice of mental events do not admit of the establishment of stable experimental conditions."