(7) The stupendous flexibility of Esperanto will be still better
understood if I state here that it possesses some 30 particles (prefixes
and suffixes), each with a definite meaning and each available whenever
you want to attach that particular meaning to any word.

We have already seen that the suffix "in" expresses the female sex
whenever it may be desirable to give it expression. So "id" denotes
the offspring, "il" the tool or instrument, "isto" the profession,
"ul" the person or individual, "ec" the quality (abstract), "ajx"
the concrete thing, product, or result, "eg" means large, and "et"
small, etc. Now, let us see how this works out in practice. Bovo is
bull; bovino, cow; bovido, calf; bovajxo, beef; bovidino, female
calf. And you may say bovego, boveto, bovinego, bovineto, bovidego,
bovideto, bovidinego, and bovidineto if you wish to add the idea of size
or smallness to the original or to the derived word.

Again: "Lern" is the root for learning. We first get lerni, to learn;
lerna, learned; lerne, learnedly; learno, learning. Next, using a few of
the particles we can make: lernebla, capable of being learned; lernema,
inclined to learn (studious); lerninda, worth learning; lernilo, a
text book (a tool); lernisto (a professional learner), a student;
lernulo, a learned person, a scholar; lerneco, learning in the abstract;
lernajxo, the matter to be learned (concrete), etc. And once more
note that what you can do with one root you can do with every root
in the vocabulary. So that the originally available number of words
is multiplied ten and hundred fold. Which simply means a tremendous
saving of labor in learning words and forms and yet secures a range of
expression and a degree of precision undreamed of in any other language.