The Torah in Parashat Vayishlah tells the famous story of the mysterious man who attacked Yaakob Abinu as he was making his way back to Eretz Yisrael from Haran. Yaakob and his assailant wrestled throughout the night, with Yaakob ultimately emerging victorious, though with an injury to his thigh which made him limp.

The Rabbis teach us that this assailant was actually not a man, but an angel. Specifically, it was Satan, who came to attempt to block Yaakob Abinu, to prevent him from continuing his journey and the process of building Am Yisrael.

The question arises, though, why did Satan attack only Yaakob? Why did he not try to obstruct the path of Abraham or Yishak? These three patriarchs built the foundations of Am Yisrael – and yet, for some reason, Satan waited until the emergence of the third patriarch, Yaakob, to launch his assault and try to prevent the rise of Hashem's special nation. Why?

Rav Elhanan Wasserman (1874-1941) answered this question by taking a closer look at the unique characteristics embodied by Abraham, Yishak and Yaakob.

Abraham, of course, embodied the attribute of Hesed, kindness, extending himself generously and selflessly for the sake of others. Even after undergoing the painful procedure of Berit Mila at an advanced age, he sat outside hoping to find weary travelers in need of hospitality whom he could invite and help.

Yishak is associated with the quality of "Aboda," serving G-d through sacrifice and prayer. This quality is best exemplified by his having been placed on an altar as a sacrifice to Hashem. He embodied the devoted service of Hashem, which nowadays, in the absence of the Bet Ha'mikdash, is done primarily through prayer.

Finally, Yaakob represents the value of intensive Torah study. He is described as a "dweller of tents" (Bereshit 25:27), referring to the halls of Torah learning. And even when he was forced to leave because of Esav's threat to kill him, he first went to the yeshiva of Eber, where he spent fourteen years diligently learning, without even taking time to sleep (Rashi, Bereshit 28:11).

Rav Elhanan explained that whereas all three qualities are vitally important components of Jewish life, it is the third of these qualities that guarantees our survival as a nation. A Jew must, of course, act with kindness, but this attribute is not unique to our nation. Other nations also recognize the great value of Hesed, and many non-Jews are wonderfully kind and generous. In fact, we are privileged to live in a country that guarantees the rights of all its citizens, and even has welfare systems in place to help the underprivileged. Clearly, Hesed is not a strictly Jewish value.

The same is true of "Aboda." Followers of all religions pray, and perform rituals in the service of their deity. And there are, unfortunately, many Jews who pray to Hashem, but without accepting the core beliefs of Judaism, or living a Torah lifestyle.

The value that sets us apart from everyone else, and which thus ensures our continuity and survival as a distinct nation, is Torah. Immersing ourselves in our sacred texts, absorbing our ancient wisdom, is what enables us to resist the lures and pressures that abound, to withstand the powerful cultural influences that are all around us, and to preserve our faith.

This is why the Satan felt threatened specifically by Yaakob, and not by Abraham or Yishak. He was not worried about the Jewish People's extraordinary devotion to Hesed, or about our filled-to-capacity houses of worship. Neither of these guarantee our eternity, because other nations are also kind and also have houses of prayer. Satan sprang into action only when he saw Yaakob Abinu, the bastion of Torah learning, because it is the devotion to intensive Torah study that ensures Am Yisrael's survival throughout the generations.

As mentioned, although the Satan was unable to eliminate Yaakob, he did succeed in crippling Yaakob, by dealing a blow to his thigh. The Zohar comments that the thigh symbolizes the supporters of Torah. Just as the legs hold up the body, the generous donors who fund Torah education are the ones who maintain the Jewish People. When the Satan realized that it was unable to destroy Yaakob, it dealt a debilitating blow to the thigh, to the support of Torah. Indeed, there has never been a shortage of Jews interested in learning Torah, but there is often difficulty in funding Torah learning. Parents are reluctant to incur the significant costs of providing their children with a Torah education, and yeshivot and kollelim struggle to raise enough money for their institutions to operate.

We must remember that Torah learning is the best "insurance policy" we have for Jewish survival. In a time when we face unprecedented spiritual challenges, when we are, sadly, witnessing assimilation on a mass scale, the best way to ensure our continuity is intensive, rigorous Torah learning. Hesed and prayer are critically important, but not sufficient. In order for us to withstand the relentless attacks of today's "Satan," the challenges it has put in our way, we must make time for our own Torah learning and also allocate the resources needed to support our Torah institutions.

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