‘Now, all this study of reckoning and geometry...must be presented to them while still young, not inthe form of compulsory instruction.’ ‘Why so?’ ‘Because,’ said I, ‘a free soul ought not to pursueany study slavishly; for while bodily labours performed under constraint do not harm the body,nothing that is learned under compulsion stays with the mind.’ ‘True,’ he said. ‘Do not, then, myfriend, keep children to their studies by compulsion but by play.’The Republic, 536d–e; 537a
Apparently one couldn't ever force children to learn anything...