When men have names in their mouths without any determinate ideas in their minds whereof they are the signs: or, 2.
When they apply the common received names of any language to ideas, to which the common use of that language does not apply them: or 3.

When they apply them very unsteadily, making them stand now for one, and by and by for another idea.
24.

Secondly, To do it with Quickness.
Secondly, Men fail of conveying their thoughts with the quickness and ease that may be, when they have complex ideas without having any distinct names for them.

This is sometimes the fault of the language itself, which has not in it a sound yet applied to such a signification; and sometimes the fault of the man, who has not yet learned the name for that idea he would show another.
25.

Thirdly, Therewith to convey the Knowledge of Things.
Thirdly, there is no knowledge of things conveyed by men's words, when their ideas agree not to the reality of things.