There is no way of proving your point to someone whose income or position depends on believing the contrary.
Arguing - Arguments Quotes
Never argue with a man who buys ink by the barrel. (about antagonizing newspaper editors)
Two men in a burning house must not stop to argue. (Ashanti)
The only thing a heated argument ever produced is coolness.
He opens the door with an ax.
Use soft words and hard arguments.
Prepare your proof before you argue.
There is no arguing with one who denies first principles.
The greatest war is the war of the mouth
The Chinese have a story based on three or four thousand years of civilization. Two Chinese coolies were arguing heatedly in the midst of a crowd. A stranger expresses surprise that no blows were being struck. His Chinese friend replied, “The man who strikes first admits that his ideas have given out.”