We ought to give our friend pain if it will benefit him, but not to the extent of breaking off our friendship; but just as we make use of some biting medicine that will save and preserve the life of the patient. And so the friend, like a musician, in bringing about an improvement to what is good and expedient, sometimes slackens the chords, sometimes tightens them, and is often pleasant, but always useful.
PlutarchLet us carefully observe those good qualities wherein our enemies excel us; and endeavor to excel them, by avoiding what is faulty, and imitating what is excellent in them.
PlutarchRome was in the most dangerous inclination to change on account of the unequal distribution of wealth and property, those of highest rank and greatest spirit having impoverished themselves by shows, entertainments, ambition of offices, and sumptuous buildings, and the riches of the city having thus fallen into the hands of mean and low-born persons. So that there wanted but a slight impetus to set all in motion, it being in the power of every daring man to overturn a sickly commonwealth.
Plutarch