_It fitly represents_[32] the quickness of sentiment and thought, which are as instantaneous as the impression of light on the eye.

Hence we always express our stronger feelings by these natural signs.

But when we want to make known to others the particular conceptions of the mind, we must represent them by parts, we must divide and analyze them.

We express _each part by certain signs_,[33] and join these together, according to the order of their relations.

Thus words are _both the instrument and signs[34] the division_ of thought."-- _Preface to Latin Gram._ 7.