Parashat Lech-Lecha begins with Hashem speaking to Avraham Avinu and commanding, לך לך – to go forth from his homeland, and journey to an unknown place, which, of course, turned out to be Eretz Yisrael . Hashem promised Avraham that he would be showered with great blessings in his new land. What was true of Avraham, the founder of our nation, is true for each and every one of us, his descendants and bearers of his legacy. In order to bring blessing into our lives, we need to respond to the call of לך לך , to leave something behind and proceed to the unknown. If we think about it, each of us has our own personal לך לך story. For some, it was leaving behind a bad habit that they were hooked on. For some, it was leaving a friend or group of friends to avoid negative influences, not knowing if they would find new friends. For some, it was turning down a shidduch because of spiritual concerns, not knowing when another good opportunity would present itself. For some, it was making a difficult school choice for themselves or their children, or a difficult career choice, not knowing what the future would bring. We have all heard the call of לך לך at some point in our lives, when we were forced to leave something behind for the sake of Hashem. There is also another call of לך לך , one which has become especially pertinent in today's day and age, and which bears particular resemblance to the original call of לך לך which was made to Avraham Avinu. And that is the call to go forth from our surroundings, to leave the society around us. In order to succeed as Hashem's special nation, we need to have the courage to "go forth," to be different, to withdraw, to separate ourselves from the surrounding culture. In order to build a nation and earn Hashem's blessings, Avraham had to leave behind the values and lifestyles of the society he grew up in. Similarly, we, his descendants, must have the strength and the resolve to "leave" our society's values that conflict with our values. Hashem promises Avraham, ונברכו בך כל משפחות האדמה – that all of mankind will be blessed through Avraham. This means that Avraham would fundamentally change the world, forever. Avraham was the first to teach the belief in Hashem, and the belief in morality, in ethical behavior, the importance of sensitivity and kindness to other people. Ironically, Avraham was able to bring about this change specifically by engaging with the people of his time, by getting involved, by interacting with society. The same man who was commanded לך לך , to separate himself and withdraw, was expected to change the world through his positive influence, which was possible only through engagement and interaction. This is the delicate, exceedingly difficult, balance that we, Avraham's heirs, need to maintain. On the one hand, we need to set up barriers, to make it clear that we are different, that we follow a different value system and embrace different beliefs than the people around us. We must have the strength and courage to resist the influences of the surrounding society, and to stubbornly cling to Torah values and traditions, even when they are drastically different from those of society. But at the same time, we are not expected to isolate ourselves completely. We are supposed to interact and engage with other people – in a manner that brings blessing to the world. We are to interact with society in such a way that we influence them, rather than being influenced by them. We are to show the world how Hashem's special nation acts, what it means to be ethical, honest, courteous and dignified. If we do this, then we will succeed in changing the world just as Avraham Avinu did, and we will succeed in continuing the mission for which he and his descendants were chosen – to be a blessing to the entire world.