The dialogues of Plato, therefore, with respect to their subjects, may be divided into the speculative, the practical, and such as are of a mixed nature. The subjects of these last are either general, comprehending both the others; or differential, distinguishing them. The general subject are either fundamental, or final: those of the fundamental kind are philosophy, human nature, the soul of man; of the final kind are love, beauty, good. The differential regard knowledge, as it stands related to practice; in which are considered two questions: one of which is, whether virtue is to he taught; the other is, whether error in the will depends on error in the judgment. The subjects of the speculative dialogues relate either to words, or to things. Of the former sort are etymology, sophistry, rhetoric, poetry; of the latter sort are science, true being, the principles of mind, outward nature. The practical subjects relate either to private conduct, and the government of the mind over the whole man; or to his duty towards others in his several relations; or to the government of a civil state, and the public conduct of a whole people. Under these three heads rank in order the particular subjects practical; virtue in general, sanctity, temperance, fortitude, justice, friendship, patriotism, piety; the ruling mind in a civil government, the frame and order of a state, law in general, and lastly, those rules of government and of public conduct, the civil laws. 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.