When he had finished his travels, Plato retired to the groves of Academus, in the neighborhood of Athens, and established a school there; his lectures were soon attended by a crowd of learned, noble, and illustrious pupils; and the philosopher, by refusing to have a share in the administration of political affairs, rendered his name more famous and his school more frequented. During forty years he presided at the head of the academy, and there he devoted his time to the instruction of his pupils, and composed those dialogues which have been the admiration of every succeeding age. His studies, however, were interrupted for a while, as he felt it proper to comply with the pressing invitations of Dionysius, of Syracuse, to visit him. The philosopher earnestly but vainly endeavored to persuade the tyrant to become the father of his people, and the friend of liberty.
In his dress, Plato was not ostentatious; his manners were elegant, but modest, simple, and without affectation. The great honors which were bestowed upon him, were not paid to his appearance, but to his wisdom and virtue. In attending the Olympian games, he once took lodgings with a family who were totally strangers to him. He ate and drank with them, and partook of their innocent pleasures and amusements; but though he told them his name was Plato, he did not speak of the employment he pursued at Athens, and never introduced the name of that great philosopher, whose doctrines he followed, and whose death and virtues were favorite topics of conversation in every part of Greece. When he returned to Athens, he was attended by the family which had so kindly entertained him; and, being familiar with the city, he was desired to show them the celebrated philosopher whose name he bore. Their surprise may be imagined, when he told them that he was the Plato whom they wished to behold.
In his diet he was moderate; and, indeed, to sobriety and temperance in the use of food, and abstinence from those indulgences which enfeeble the body and enervate the mind, some have attributed his preservation during a terrible pestilence which raged in Athens at the beginning of the Peloponnesian war. Plato was never subject to any long or lingering indisposition; and, though change of climate had enfeebled a constitution naturally strong and healthy, the philosopher lived to an advanced age, and was often heard to say, when his physicians advised him to leave his residence at Athens, where the air was impregnated by the pestilence, that he would not advance one single step to gain the top of Mount Athos, were he assured of attaining the longevity which the inhabitants of that mountain were said to enjoy. Plato died on his birth-day, in the eighty-first year of his age, about the year 348 B. C. His last moments were easy, and without pain; and, according to some authors, he expired in the midst of an entertainment; but Cicero tells us that he died while in the act of writing.
The works of Plato are numerous; with the exception of twelve letters, they are all written in the form of dialogue, in which Socrates is the principal interlocutor. Thus he always speaks by the mouth of others, and the philosopher has nowhere made mention of himself, except once in his dialogue entitled Phædon, and another time in his Apology for Socrates. His writings were so celebrated, and his opinions so respected, that he was called divine; and for the elegance, melody, and sweetness of his expressions, he was distinguished by the appellation of the Athenian bee. His style, however, though commended and admired by the most refined critics among the ancients, has not escaped the censure of some of the moderns. It is obvious that the philosopher cannot escape ridicule, who supposes that fire is a pyramid tied to the earth by numbers; that the world is a figure consisting of twelve pentagons; and who, to prove the metempsychosis and the immortality of the soul, asserts that the dead are born from the living, and the living from the dead. The speculative mind of Plato was employed in examining things divine and human; and he attempted to ascertain and fix not only the practical doctrines of morals and politics but the more subtle and abstruse theory of mystical theogony—the origin of the gods, or divine power. His philosophy was universally received and adopted in ancient times, and it has not only governed the opinions of the speculative part of mankind, but it continues still to influence the reasoning, and to divide the sentiments of the moderns.
In his system of philosophy, he followed the physics of Heraclitus, the metaphysical opinions of Pythagoras, and the morals of Socrates. He maintained the existence of two beings—one self-existent, and the other formed by the hand of a pre-existent, creative god and man. The world, he maintained, was created by that self-existent cause, from the rude, undigested mass of matter which had existed from all eternity, and which had ever been animated by an irregular principle of motion. The origin of evil could not be traced under the government of a deity, without admitting a stubborn intractability and wildness congenial to matter; and from these, consequently, could be demonstrated the deviations from the laws of nature, and from thence, the extravagant passions and appetites of men.
From materials like these were formed the four elements, and the beautiful structure of the heavens and the earth; and into the active but irrational principle of matter, the divinity infused a rational soul. The souls of men were formed from the remainder of the rational soul of the world, which had previously given existence to the invisible gods and demons. The philosopher, therefore, supported the doctrine of ideal forms, and the pre-existence of the human mind, which he considered as emanations of the Deity, and which can never remain satisfied with objects or things unworthy of their divine original. Men could perceive, with their corporeal senses, the types of immutable things, and the fluctuating objects of the material world; but the sudden changes to which these are continually liable, create innumerable disorders, and hence arise deception, and, in short, all the errors of human life. Yet, in whatever situation man may be, he is still an object of divine concern, and, to recommend himself to the favor of the pre-existent cause, he must comply with the purposes of his creation, and, by proper care and diligence, he can recover those immaculate powers with which he was naturally endowed.
All science the philosopher made to consist in reminiscence—in recalling the nature, forms, and proportions, of those perfect and immutable essences, with which the human mind had been conversant. From observations like these, the summit of felicity might be attained by removing from the material, and approaching nearer to the intellectual world; by curbing and governing the passions, which were ever agitated and inflamed by real or imaginary objects.
The passions were divided into two classes: the first consisted of the irascible passions, which originated in pride or resentment, and were seated in the breast; the other, founded on the love of pleasure, was the concupiscible part of the soul, seated in the inferior parts of the body. These different orders induced the philosopher to compare the soul to a small republic, of which the reasoning and judging powers were stationed in the head, as in a firm citadel, and of which the senses were the guards and servants. By the irascible part of the soul, men asserted their dignity, repelled injuries, and scorned danger and the concupiscible part provided the support and the necessities of the body, and, when governed with propriety, gave rise to temperance. Justice was produced by the regular dominion of reason, and by the submission of the passions; and prudence arose from the strength, acuteness, and perfection of the soul, without which other virtues could not exist.
But amidst all this, wisdom was not easily attained; at their creation all minds were not endowed with the same excellence; the bodies which they animated on earth, were not always in harmony with the divine emanation; some might be too weak, others too strong. On the first years of a man’s life depended his future character; an effeminate and licentious education seemed calculated to destroy the purposes of the divinity, while the contrary produced different effects, and tended to cultivate and improve the reasoning and judging faculty, and to produce wisdom and virtue.
Plato was the first who supported the immortality of the soul upon arguments solid and permanent, deduced from truth and experience. He did not imagine that the diseases and death of the body could injure the principle of life, and destroy the soul, which, of itself, was of divine origin, and of an incorrupted and immutable essence, which, though inherent for a while in matter, could not lose that power which was the emanation of God. From doctrines like these, the great founder of Platonism concluded that there might exist in the world a community of men, whose passions could be governed with moderation, and who, from knowing the evils and miseries which arise from ill conduct, might aspire to excellence, and attain that perfection which can be derived from a proper exercise of the rational and moral powers. To illustrate this more fully, the philosopher wrote a book, well known by the name of the “Republic of Plato,” in which he explains, with acuteness, judgment, and elegance, the rise and revolution of civil society; and so respected was his opinion as a legislator, that his scholars were employed in regulating the republics of Arcadia.