There were two old men who dwelt together for many years and who never quarreled. Then one said to the other: "Let us pick a quarrel with each other like other men do. 

"I do not know how quarrels arise," answered his companion. 

So the other said to him: "Look, I will put a brick down here between us and I will say "This is mine." Then you can say "No it is not, it is mine." Then we will be able to have a quarrel." 

So they placed the brick between them and the first one said: "This is mine." 

His companion answered him: "This is not so, for it is mine." 

To this, the first one said: "If it is so and the brick is yours, then take it and go your way." 

And so they were not able to have a quarrel.