Musar על אבות 5:13

Avot 5,13 discusses four basic attitudes amongst people, i.e. the one who says: "what is mine is mine and what is yours is yours." Such an attitude is called "average" by some, and extremely negative, i.e. the attitude of the people of Sodom, by others. The second attitude is that of people who say: "What is mine is yours, but what is yours (by the same token) is mine." This attitude is categorised as that of an ignoramus. The third attitude: "what is yours is yours, and what is mine is yours (at your disposal) also," is described as the attitude of the pious; finally, there is an attitude which proclaims: "what is mine is mine, and what is yours is mine also;" this is the attitude of the wicked.