Quarrels would not last long if the fault was only on one side. François de La Rochefoucauld
There is no sport in hate when all the rage is on one side. Percy Bysshe Shelley
Objectivity does not exist. The word is a hypocrisy which is sustained by the lie that the truth stays in the middle. No, sir: Sometimes truth stays on one side only. Oriana Fallaci
Courtesy that is all on one side cannot last long. French Proverb
Courtesy on one side can never last long. Persian Proverb
If left on one side it will burn. Amharic Proverb