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Confucius made it clear that he would only teach those students who were passionate about learning:
 

I do not enlighten those who are not eager to learn, nor arouse those who are not quick to give an explanation themselves.

If I have presented one corner of the square and they cannot come back to me with the other three, I should not go over the points again.

(Confucius)

Peter Southwood adhered to this maxim rigidly and expected a lot from students who desired to steal his art.
At first you may see this approach as being unduly harsh.
Yet, as with so many examples of ancient Chinese wisdom it more subtle, more relevant and more true than you may realise.