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Just as philosophy leads to friendship, so friendship leads to philosophy. In the Phaedrus, which was most probably written several years after the Lysis, Socrates and Phaedrus go out into the idyllic countryside just outside Athens and have a long conversation about the anatomy of the soul, the nature of true love, the art of persuasion (rhetoric), and the merits of the spoken over the written word.
At the end of this conversation, Socrates offers a prayer to the local deities. This is the famous Socratic prayer, which is notable both in itself and for the response that it elicits from Phaedrus.
Socrates: Beloved Pan, and all ye other gods who haunt this place, give me beauty in the inward soul; and may the outward and inward man be at one. May I reckon the wise to be the wealthy, and may I have such a quantity of gold as a temperate man and he only can bear and carry. —Anything more? The prayer, I think, is enough for me.
Phaedrus: Ask the same for me, for friends should have all things in common.
Plato may fail to define friendship in the Lysis, but in the Phaedrus he gives us its living embodiment. Socrates and Phaedrus spend their time together enjoying the beautiful Attic countryside while engaging in honest and open philosophical conversation. By exercising and building upon reason, they are not only furthering each other’s understanding, but also transforming a life of friendship into a life of joint contemplation of those things that are most true and hence most beautiful and most dependable.
At one point, during a lull in their conversation, Socrates insists that they continue talking, lest the cicadas laugh at them for avoiding conversation at midday, and mistake them for a pair of slaves who have come to their resting place as cattle to a waterhole. On the other hand, if the cicadas see that they are not lulled by their chirruping, they may, out of respect, offer them their god-given gifts.
For once upon a time, before the birth of the Muses, the cicadas used to be human beings. Then the Muses were born and song was created, and they were so overwhelmed with the pleasure of singing that they forgot to eat or drink and died without even realizing it. As a gift from the Muses, they were reborn as cicadas, singing from the moment they are born to the moment they die without ever feeling hunger or thirst. After dying, the cicadas report back to the Muses in heaven about who is honoring them on earth, and win the love of Terpsichore for the dancers, of Erato for the lovers, and of Calliope, the eldest Muse, for the philosophers.
If only on the basis of his response to the Socratic prayer, it is obvious that Phaedrus is another self to Socrates, since he makes the same choices as Socrates and even justifies making those choices on the grounds that their friendship requires it. Thus, whereas Aristotle tries to tell us what perfect friendship is, Plato lets us feel it in all its allure and transformative power.