" Children who are taught literature or painting or music to excess, or with a view to correctness rather than to self-expression, become progressively less interested in the aesthetic side of life. Even a boy’s interest in mechanical devices can be killed by too much instruction. If you teach a boy the principle of the common pump in lesson-time, he will try to avoid acquiring the knowledge you are trying to impart, whereas if you have a pump in your back yard and forbid him to touch it he will spend all his leisure studying it. A great many of these troubles are avoided by making lessons voluntary. "

― Bertrand Russell , Education and the Social Order