On this
page on Plato and his 'critics', there is interesting background to the saying by Livy (Titus Livius):
I might here have a fair occasion to answer the invectives that have been made against Plato in our time: But since they come only from such persons as never read so much as one of his Dialogues, perhaps they'll change their sentiments when once they have read him. Besides, 'tis wasting of one’s time to defend Plato, for he sufficiently defends himself; and that may be said of him with yet more justice, which the greatest of the Latin historians said of Cato, equally ridiculing the praises Cicero had given him, and the satyrs Cesar had made on him. *None could ever augment the Glory of this Great Man by his praises, nor diminish it by his Satyrs.
*Cujus gloriae neque profuit quisquam laudando, nec vituperando quisquam nocuit. Titus Livius
As someone else very succinctly puts it: the character of Cato stood alike above censure and above eulogy.