Perhaps I ought not to say it will produce _no_ good effect, for good does sometimes result as a sort of accidental consequence from almost any thing.

I mean it will have no effectual _tendency_ to do good.

You must vary your method, too, in order to interest your pupils.
Watch their countenances when you are addressing them, and see if they look interested.

If they do not, be assured that there is something wrong, or at least something ill-judged or inefficient in your manner of explaining the truths which you wish to have produce an effect upon their minds.
That you may be prepared to bring moral and religious truths before their minds in the way I have described, your own mind must take a strong interest in this class of truths.

You must habituate yourself to look at the moral and religious aspects and relations of all that you see and hear.