i recently signed onto the Rav Kook List at http://ravkooktorah.org/ and just received this commentary on Parshat Toldot: Harnessing the Power of Esau.
Perhaps you will find this excerpt helpful, or better yet, read it all.
Restraint versus Control
Just as there are both positive and negative forces in the world, so too, every person is a composite of positive and negative traits. We need these negative forces, however; without their power and vitality, many goals and aspirations would lack the energy necessary to be realized.
Esau represents the raw, base forces in the world. His reddish complexion indicated the violent and brutal nature of his personality. Jacob did not prevent Esau from coming into the world; after all, the world needs Esau and his raw power. Rather, Jacob held on to Esau's heel, holding him back. The name Jacob refers to this aspect of restraint, reining in the fierce forces.
Ultimately, however, our goal is not to simply hold back these negative forces. We aspire to gain control over them and utilize them, like a hydroelectric dam that harnesses the vast energy of a raging waterfall for the production of electricity. For example, the Talmud tells us that a person with blood-thirsty tendencies should become a shochet (ritual slaughterer) or a mohel, thus sublimating his violent nature for noble purposes. This higher aspiration is represented by Jacob's second name, Israel, which comes from the root-word sar, meaning 'to rule.'
The name Jacob is appropriate when the Jews are in the Diaspora. There, they serve as a moral conscience to partially restrict the wild and violent forces in the world. But when redeemed and living in their own land, the Jewish people are able to attain the higher level of Israel. Then they have the opportunity to demonstrate how a nation may utilize its material capabilities for constructive and ethical goals.

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