If a scholar asks a question which you can not answer, or brings you a difficulty which you can not solve, say frankly, "I do not know." It is the only way to avoid continual anxiety and irritation, and the surest means of securing real respect.

Let the scholars understand that the superiority of the teacher does not consist in his infallibility, or in his universal acquisitions, but in a well-balanced mind, where the boundary between knowledge and ignorance is distinctly marked; in a strong desire to go forward in mental improvement, and in fixed principles of action and systematic habits.

You may even take up in school a study entirely new to you, and have it understood at the outset that you know no more of it than the class commencing, but that you can be their guide on account of the superior maturity and discipline of your powers, and the comparative ease with which you can meet and overcome difficulties.

This is the understanding which ought always to exist between master and scholars.
The fact that the teacher does not know every thing can not long be concealed if he tries to conceal it, and in this, as in every other case, HONESTY IS THE BEST POLICY..