There is no way to hinder his exuberant self-discharges except by measures which embarrass and baffle him.

We can not "lead him into all truth"; we have to drive him back from all error.

The lessons of psychology are to the effect that the normal way to teach caution and deliberation is the way of failure, repulse, and unfortunate, even painful, consequences.

Personal appeals to him do little good, since it is a part of his complaint that he is too ready to hear all appeals; and also, since he is not aware of his own lack nor able to carry what he hears into effect.

So keep him in company of scholars a little more advanced than he is.