יעקב was a clever young man, a genius, who lived in a small village in Russia. He studied תורה day and night. In the same village lived several Lubavitcher חסידים , who had been trying for a long time to convince the talented boy to come with them to the רבי .
But יעקב , who was not raised in a חסידישע home, was not interested. "I don't need a רבי ," he would answer them. "If I come across a problem in the גמרא , I just keep studying till I figure it out myself."
Nonetheless, one time he got curious, and he went with the חסידים to the רבי , ר ‘ שלום דובער (the רבי רש “ ב ). They arrived in Lubavitch on a Friday. That שבת , יעקב felt like he was on a רוחניות high. The general atmosphere of the town was affecting him.
After שבת , as they prepared to leave, יעקב wrote a short note to give to the רבי . He trembled as he waited his turn for a יחידות . When יעקב entered the רבי 's room he found the רבי sitting and studying a ספר . The רבי did not lift his eyes to look at him. יעקב tiptoed over to the desk and placed his note on it. The רבי gave no sign that יעקב was even in the room.
Suddenly the רבי stood up and paced back and forth. As if talking to himself, he began to speak in Russian: "On! Nye on!" ("It is him! It's not him!") On! Nye on! On! Nye on..." The רבי paused for a long while before saying finally: "Nye on!" He then sat down and continued learning.
יעקב left the רבי 's room confused and puzzled. Not only had the רבי ignored him, but his strange words kept echoing in his head. יעקב did not know what to make of it.
One day יעקב was reading the newspaper when he noticed a contest being sponsored by the University of Petersburg. Whoever solved the mathematical problem printed in the paper would win a prize of 300 rubles. יעקב decided to try it. He studied the problem and sent off his answer by mail. A short time later a letter arrived from the University informing him that he had won. Enclosed with the letter was a personal invitation from the head of the mathematics department, and a train ticket.
יעקב traveled to Petersburg. The professors were surprised in the beginning when they saw יעקב dressed like a frum איד , but they quickly realised how clever he was. After giving him the prize, they offered him a full scholarship to the University, which יעקב accepted.
In the beginning יעקב kept up his unique dress and מנהגים , and even learned a little תורה . But the more he grew at the University, the further away from אידישקייט he went. The outside signs were the first to go; eventually יעקב completely left the path of תורה and מצוות .
A few years later יעקב was appointed as a full professor. Of course, beforehand, יעקב had to give up his אידישקייט . But this didn’t bother him at all.
As time passed, however, יעקב 's נשמה began to bother him. Although he was very sorry for what he had done, he couldn’t do anything about it. In those days, a gentile who converted to אידישקייט or a איד who accepted Christianity but later went back could be killed.
יעקב had become a very good hunter. One day while he was out in the field, יעקב 's horse began to gallop uncontrollably. The reins weren’t working, and it was clear that if a נס wouldn't happen, these were the last seconds of יעקב 's life. At that moment יעקב decided to do תשובה and return to ה ‘ . Incredibly, the horse slowed down and stopped galloping.
That night יעקב packed a small bundle and snuck out of his house, leaving his גוי ‘ שע life behind him for good. He wandered from city to city and from town to town, terrified of being discovered. His return to אידישקייט put his life in danger, but his decision to live as a איד never changed.
One day, while יעקב was eating at an inn in a far-away village, the police burst in and began to check everyone’s identity papers. יעקב , who was not carrying any identification, was taken into prison.
The investigator at the police station kept looking carefully at the photograph in his hand, then glancing up at יעקב . From the corner of his eye יעקב saw that it was a picture of himself as he used to look at the University: clean-shaven, fashionably dressed, and with a carefully styled lock of hair on his forehead.
The investigator was clearly hesitant. Unable to decide he began to mutter under his breath. "On!" ("It is him!") A second later he changed his mind. "Nye on!" ("It's not him!") "On!" "Nye on!" Back and forth he went, studying the photograph and יעקב in turn. "Nye on!" he decided in the end, and ordered that יעקב be freed.
יעקב left the police station shocked; he knew where he had last heard those very words. Immediately he set off for Lubavitch, and stayed there for the rest of his life.