A FIGURE is simply a word or a sentence thrown into a peculiar form, different from its original or simplest meaning or use. These forms are constantly used by every speaker and writer. It is impossible to hold the simplest conversation, or to write a few sentences without, it may be unconsciously, making use of figures. We may say, "the ground needs rain": that is a plain, cold, matter-of-fact statement; but if we say "the ground is thirsty," we immediately use a figure. It is not true to fact, and therefore it must be a figure. But how true to feeling it is! how full of warmth and life! Hence, we say, "the crops suffer"; we speak of "a hard heart," "a rough man," "an iron will." In all these cases we take a word which has a certain, definite meaning, and apply the name, or the quality, or the act, to some other thing with which it is associated, by time or place, cause or effect, relation or resemblance...
It may be asked, "How are we to know, then, when words are to be taken in their simple, original form (i.e., literally), and when they are to be taken in some other and peculiar form (i.e., as a Figure)?" The answer is that, whenever and wherever it is possible, the words of Scripture are to be understood literally, but when a statement appears to be contrary to our experience, or to known fact, or revealed truth; or seems to be at variance with the general teaching of the Scriptures, then we may reasonably expect that some figure is employed. And as it is employed only to call our attention to some specially designed emphasis, we are at once bound to diligently examine the figure for the purpose of discovering and learning the truth that is thus emphasized.
It may be asked, "How are we to know, then, when words are to be taken in their simple, original form (i.e., literally), and when they are to be taken in some other and peculiar form (i.e., as a Figure)?" The answer is that, whenever and wherever it is possible, the words of Scripture are to be understood literally, but when a statement appears to be contrary to our experience, or to known fact, or revealed truth; or seems to be at variance with the general teaching of the Scriptures, then we may reasonably expect that some figure is employed. And as it is employed only to call our attention to some specially designed emphasis, we are at once bound to diligently examine the figure for the purpose of discovering and learning the truth that is thus emphasized.
- from page XV, Figures of Speech Used in the Bible