He avoids confusion and perplexity.

But no skill or classification will turn the poor teacher's hundred scholars into one, or enable him, except to a very limited extent, and for a very limited purpose, to regard them as one.

He has a distinct and, in many respects, a different work to do for every one of the crowd before him.
Difficulties must be explained in detail, questions must be answered one by one, and each scholar's own conduct must be considered by itself.

His work is thus made up of a thousand minute particulars, which are all crowding upon his attention at once, and which he can not group together, or combine, or simplify.

He must, by some means or other, attend to them in all their distracting individuality.