Teach a child arithmetic," he said at last, "and he can use it to cheat with, can't he? Teach a man the laws and forces of the universe, and he can turn them against his teacher, can't he? Give a child a box of matches, and there will always be some one to show him how to set fire to a house. Teach me spiritual knowledge, and for every one desire to use it rightly I shall have a thousand impulses to do the wrong thing. Persistence in thinking the wrong thing makes a man a fool if he is untaught and a dugpa if he knows too much. Do you think you know enough to be a dugpa?