The meaning of Republic 606a3–b5

If you would reflect that the part of the soul that in the former case, in our own misfortunes, was forcibly restrained, and that has hungered for tears and a good cry and satisfaction, because it is its nature to desire these things, is the element in us that the poets satisfy and delight, and that the best element in our nature, since it has never been properly educated by reason or even by habit, then relaxes its guard over the plaintive part, inasmuch as this is contemplating the woes of others and it is no shame to it to praise and pity another who, claiming to be a good man, abandons himself to excess in his grief; but [he] thinks this vicarious pleasure is so much clear gain, and would not consent to forfeit it by disdaining the poem altogether.