In this manner the knowledge they acquire will become their own.

It will be incorporated, as it were, into their very minds, and they can not afterward be deprived of it.
The exercises which have for their object this rendering familiar what has been learned may be so varied as to interest the pupil very much, instead of being tiresome, as it might at first be supposed.
Suppose, for instance, a teacher has explained to a large class in grammar the difference between an adjective and an adverb; if he leave it here, in a fortnight one half of the pupils would have forgotten the distinction, but by dwelling upon it a few lessons he may fix it forever.

The first lesson might be to require the pupils to write twenty short sentences containing only adjectives.

The second to write twenty containing only adverbs.

The third to write sentences in two forms, one containing the adjective, and the other expressing the same idea by means of the adverb, arranging them in two columns, thus: He writes well.