He would continually say that for the conduct of life we need right reason or a halter. Observing Plato one day at a costly banquet taking olives, How is it, he said, that you the philosopher who sailed to Sicily for the sake of these dishes, now when they are before you do not enjoy them? Nay, by the gods, Diogenes, replied Plato, there also for the most part I lived upon olives and such like. Why then, said Diogenes, did you need to go to Syracuse? Was it that Attica at that time did not grow olives? But Favorinus in his Miscellaneous History attributes this to Aristippus. Again, another time he was eating dried figs when he encountered Plato and offered him a share of them. When Plato took them and ate them, he said, I said you might share them, not that you might eat them all up.
The quote: And one day when Plato had invited to his house friends coming from Dionysius, Diogenes trampled upon his carpets and said, I trample upon Plato’s vainglory.
Plato’s reply was, How much pride you expose to view, Diogenes, by seeming not to be proud. Others tell us that what Diogenes said was, I trample upon the pride of Plato, who retorted, Yes, Diogenes, with pride of another sort. Sotion, however, in his fourth book makes the Cynic address this remark to Plato himself. Diogenes once asked him for wine, and after that also for some dried figs; and Plato sent him a whole jar full. Then the other said, If some one asks you how many two and two are, will you answer, Twenty?