מוסר אויף מיכה 2:2

He whose nature is overcome by this disposition is blameworthy, for it leads him to envy, and a noble man is never found to be envious. Books (i.e., of poetry) have been filled with the censure of envy, and every man of intelligence knows how much has been said as to its baseness. It is necessary to turn from it, for frequently the affairs of the envious lead him to use violence. Thus it is said of such as these (Micah ii. 2), "And they covet fields and take them by violence." Enviousness is a loathsome trait. The wise man must keep himself as far from it as he can, for he gains no advantage through it: on the contrary, continued depression and fatigue of the spirit through desires and the constant hatred of men, scantiness of repose, preoccupation of the mind, apprehensiveness and the punishment of God, for transgressing that which He forbade in His revealed Scripture. Man must not be jealous of unrighteous men, because he sees them devote themselves to pleasure and (the gratifying of) passions. But let him employ his zeal in the service of God. Thus the sage said (Prov. xxiii. 17), "Let not thy heart be envious of the sinners." Again he spake (Ps. xxxvii. i), "Be thou not envious against the workers of iniquity."

The מכילתא on Exodus 20,14 comments in a vein similar to what Maimonides has written. The commandment of לא תתאוה is seen as a preliminary stage to לא תחמוד. As long as the desire is not yet accompanied by plans to acquire the desired object, regardless of the owner's attitude, one is guilty only of לא תתאוה. As soon as one plans to obtain possession of the object of one's desire one becomes guilty of violating the commandment of לא תחמוד. How do I know that the plan to acquire someone else's property against his will eventually will lead to robbery? We know this from Michah 2,2: וחמדו שדות וגזלו , "They covet fields and seize them."

Now any man who has this quality strongly within him, is very despicable, for jealousy brings a person to lust, for when a man does not pay attention to what his companion acquires, he does not lust. And the Torah said, "You shall not lust after the wife of your neighbor… and anything that belongs to your neighbor" (Exod. 20:14). A man who is overpowered by lust, is very close to transgressing the Ten Commandments. A parable that will illustrate this is the story of a man who had a neighbor and there was a wall that separated them and their property. Now the wicked man coveted the wife of his neighbor, and also some of his possessions. One day he overheard the man say to his wife, "I shall have to leave for a while for business," and thus he did. What did the wicked man do? On Sabbath eve, he went and broke the wall that was between them. And thus, he had already transgressed the commandment to "remember and keep the Sabbath." He then forcibly attacked the wife of his neighbor, and in that way transgressed the commandment that "You shall not covet" and he lay with her, and thus he transgressed the commandment "You shall not commit adultery." And after that when he began to plunder the possessions of his neighbor, the woman cried out, and when she cried out, he slew her — and so he transgressed the commandment "You shall not commit murder." And after he had robbed and stolen what he lusted for, he had already transgressed the commandment, "You shall not steal" as well as "You shalt not covet." Then his father and his mother stood up and rebuked him. He arose up against them and struck them, and thus he transgressed the commandment "Honor your father and your mother." And afterwards, when he was brought to court, he and his worthless companions testified that the property found in his possession had been left with him as a pledge by his neighbor and that he had permitted his neighbor to take them back in trust even though he had not paid. He had trusted his neighbor with the pledge and had never been able to obtain possession of them until now when the robbers had broken the wall which was between their properties and had slain the woman and that when he heard the commotion he had entered and taken back his pledge. Now by this testimony, he transgressed against the commandment "You shall not utter false testimony against your neighbor." Then continually, wherever he went, he swore that he had done nothing wrong, and so he transgressed against the commandment, "You shall not take the name of the Lord, your God, in vain." Finally, his crimes were revealed and his wrong became known far and wide. Because of this disgrace, he became utterly depraved, denied the living God and thus he transgressed against the First Commandment, "I am the Lord thy God." Finally, he became attached to idolatry and thus he transgressed the command "You shall have no other gods, you shall not bow down before them and you shall not serve them." And all of this was caused by his lust! Thus we find that lust can bring one very near to transgress against all of the Torah.