Thus, for the sake of giving the reader a scientific, that is a comprehensive, and at the same time a distinct view of Plato's writings, we have attempted to exhibit to him, their just and natural distinctions; whether he chooses to consider them with regard to their inward form or essence, their outward form or appearance, their matter; or their end: that is, in those more familiar terms, we have used in this Synopsis, their genius, their character, their subject, and their design.
And here it is requisite to observe, that as it is the characteristic of the highest good to be universally beneficial, though some things are benefitted by it more and others less, in consequence of their greater or less aptitude to receive it; in like manner the dialogues of Plato are so largely stamped with the characters of sovereign good, that they are calculated to benefit in a certain degree even those who are incapable of penetrating their profundity. They can tame a savage sophist, like Thrasymachus in the Republic; humble the arrogance even of those who are ignorant of their ignorance; make those to become proficients in political, who will never arrive at theoretic virtue; and, in short, like the illuminations of deity, wherever there is any portion of aptitude in their recipients, they purify, irradiate, and exalt.
After this general view of the dialogues of Plato, let us in the next place consider their preambles, the digressions with which they abound, and the character of the style in which they are written. With respect to the first of these, the preambles, however superfluous they may at first sight appear, they will be found on a closer inspection necessary to the design of the dialogues which they accompany. Thus the prefatory part of the Timaeus unfolds, in images agreeably to the Pythagoric custom, the theory of the world; and the first part of the Parmenides, or the discussion of ideas, is in fact merely a preamble to the second part, or the speculation of the one; to which however it is essentially preparatory. Hence, as Plutarch says, when he speaks of Plato's dialogue on the Atlantic island: These preambles are superb gates and magnificent courts with which he purposely embellishes his great edifices, that nothing may be wanting to their beauty, and that all may be equally splendid. He acts, as Dacier well observes, like a great prince, who, when he builds a sumptuous palace, adorns (in the language of Pindar) the vestibule with golden pillars. For it is fit that what is first seen should be splendid and magnificent, and should as it were perspicuously announce all that grandeur which afterwards presents itself to the view.