“He is not a partner in a shared activity. Were he to become a copartner, he would, in engaging in the conjoint activity, have the same interest in its accomplishment which others have. He would share their ideas and emotions. Now in many cases—too many cases—the activity of the immature human being is simply played upon to secure habits which are useful. He is trained like an animal rather than educated like a human being.
His instincts remain attached to their original objects of pain or pleasure. But to get happiness or to avoid the pain of failure he has to act in a way agreeable to others. In other cases, he really shares or participates in the common activity.”