The Göttingen physicist Georg Christoph Lichtenberg wrote in one of his notebooks: Man sollte sich nicht schlafen legen, ohne sagen zu können, daß man an dem Tage etwas gelernt hätte. (One should not go to sleep without being able to say that one has learned something that day.) He did not mean a new word. He meant, among other things, the Verbesserung eines Irrtums, in dem wir uns lange befunden haben, the correction of an error we have long held. This could not be done quickly before blowing out the candle. The occupations of the whole day had to aim at it.
In the same notebook stands his much-quoted line about change: Ich kann freilich nicht sagen, ob es besser werden wird wenn es anders wird; aber so viel kann ich sagen, es muß anders werden, wenn es gut werden soll. (I certainly cannot say whether it will get better if it gets different. But this much I can say: it must get different if it is to get good.)