Rav Kook inferred that the Torah's phraseology - "after all the desire of your soul you may eat meat" - contained a concealed reproach. [iii] He predicted that a day would come when people will detest eating the flesh of animals because of a moral loathing - "and then it shall be said that 'because your soul does not long to eat meat, you will not eat meat.'"

http://www.jewishveg.com/schwartz/kook-expanded.html

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"When G-d your G-d shall broaden your borders, as He has promised you, and you will say, "I shall eat meat," for your soul shall desire to eat meat, you may eat meat to your soul’s desire".

The human being cannot live without the vegetable and mineral components of his diet. Thus, he is compelled to eat them by the most basic of his physical drives—the preservation of his existence. Meat, however, is not a necessity but a luxury; the desire for meat is not a desire motivated by need, but desire in its purest sense—the desire to experience pleasure.

This means that the elevation of meat requires a greater spiritual sensitivity on the part of its consumer than that of other foods. When a person eats a piece of bread and then studies Torah, prays or gives charity, the bread has directly contributed to these deeds. In order to perform these deeds, the soul of man must be fused with a physical body, and the piece of bread was indispensable to this fusion.

Man does not eat meat to live, but to savor its taste; thus, it is not enough that a person lives in order to serve his Creator for the meat he eats to be elevated. Rather, he must be a person for whom the very experience of physical pleasure is a G-dly endeavor. A person for whom the physical satisfaction generated by a tasty meal translates into a deeper understanding of Torah, a greater fervor in prayer, and a kinder smile to accompany the coin pressed into the palm of a beggar.2

Thus the Torah says: "When G-d your G-d shall broaden your borders, as He has promised you... you may eat meat to your soul’s desire." From this the Talmud3 derives that originally they were forbidden to eat 'meat by desire'. It was only after G-d "broadened their borders," granting us a mandate to make "holy" an adjective of "land," that we were enabled to sanctify this most corporeal corner of human life.4

http://www.askmoses.com/en/article/259,2175818/What-is-the-J...