Phaedrus:

The Phaedrus is closely connected with the Symposium, and may be regarded either as introducing or following it. The two Dialogues together contain the whole philosophy of Plato on the nature of love, which in the Republic and in the later writings of Plato is only introduced playfully or as a figure of speech. But in the Phaedrus and Symposium love and philosophy join hands, and one is an aspect of the other