Musar su Ecclesiaste 4:4

THIS quality is an offshoot of wrath. Most rational beings are not exempt from it: but it is in them all, for we see men seeking to imitate the actions of their companions. For instance, when one (man) sees that his friend has acquired some worldly gain, mineral, animal, or vegetable, or other possessions, he likewise endeavors to acquire similar things, although he be able to dispense with them or compensate himself with other things in their stead. Let him not protract his endeavor, nor set his heart upon attaining such possessions. This is the expression to which the sage, peace be upon him, gave utterance (Eccl. iv. 4), "Again I considered all travail and every right work, that for this a man is envied of his neighbor."

Envy is a branch of anger, and no man escapes from it completely. For we see that among men each one tries to keep-up with one's neighbor. For when he sees that his neighbor acquires food or clothes, or a home or amasses money, then he too endeavors to attain the same, thinking, "My fellow has all this; I must also have it." And concerning this matter, Solomon hinted : "Again, I considered all labour and all excelling in work, that it is a man's rivalry with his neighbor" (Eccl. 4:4).