The intention with which the educator is to approach his work, this practical reflection, provisionally detailed down to the measures which our present state of knowledge suggests we should choose, is to my mind the first half of pedagogics. But there must be a second in which the possibility of education is theoretically explained and presented with its limitations in the light of changing circumstances.

Herbart (1982b, p. 22), as cited in: Norbert Hilgenheger, "Johann Friedrich Herbart (1776-1841)." Kwartalnik Pedagogiczny 3-4 (1999): 5-26.