Experience shows that what great role pratice and experience play in education; pratice, the prolonged exercice lead to habit: exemple suggests imitation. Habit can become a second nature, but, wrongly directed (or guided), it may also heighten (or intensify) unfortunate tendencies and be an obstacle to progress.
The brutalities of progress are called revolutions. When they are over we realize this: that the human race has been roughly handled, but that it has advanced.
The more we progress the more we tend to progress. We advance not in arithmetical but in geometrical progression. We draw compound interest on the whole capital of knowledge and virtue which has been accumulated since the dawning of time.
The population of the world is a conditional population; these are not the best, but the best that could live in the existing state of soils, gases, animals, and morals: the best that could yet live; there shall be a better, please God.