A very enlightened philosopher has remarked that people often express themselves by figures; that nothing is more common or more natural than the turns called tropes.
Thus, in all languages, the heart burns, courage is kindled, the eyes sparkle; the mind is oppressed, it is divided, it is exhausted; the blood freezes, the head is turned upside down; we are inflated with pride, intoxicated with vengeance. Nature is everywhere painted in these strong images, which have become common.
It is from her that instinct learns to assume a modest tone and air, when it is necessary. The natural desire of captivating our judges and masters; the concentrated energies of a profoundly stricken soul, which prepares to display the sentiments which oppress it, are the first teachers of this art.
It is the same nature which sometimes inspires lively and animated sallies; a strong impulse or a pressing danger prompts the imagination suddenly. Thus a captain of the first caliphs, seeing the Mussulmans fly from the field of battle, cried out, "Where are you running to? Your enemies are not there."
This speech has been given to many captains; it is attributed to Cromwell. Strong minds much oftener accord than fine wits.
Rasi, a Mussulman, captain of the time of Mahomet, seeing his Arabs frightened at the death of their general, Derar, said to them, "What does it signify that Derar is dead? God is living, and observes your actions."
Where is there a more eloquent man than that English sailor who decided the war against Spain in 1740? "When the Spaniards, having mutilated me, were going to kill me, I recommended my soul to God, and my vengeance to my country!"
Nature, then, elicits eloquence; and if it be said that poets are created and orators formed, it is applicable only when eloquence is forced to study the laws, the genius of the judges, and the manners of the times. Nature alone is spontaneously eloquent.
The precepts always follow the art. Tisias was the first who collected the laws of eloquence, of which nature gives the first rules. Plato afterwards said, in his "Gorgias," that an orator should have the subtlety of the logician, the science of the philosopher, almost the diction of the poet, and the voice and gesture of the greatest actors.
Aristotle, also, showed that true philosophy is the secret guide to perfection in all the arts. He discovered the sources of eloquence in his "Book of Rhetoric." He showed that logic is the foundation of the art of persuasion, and that to be eloquent is to know how to demonstrate.