A Litvishe fellow in Kollel came to New York for Shavuot. He went to 770 (central Chabad headquarters) and asked Rabbi Groner for an appointment for yechidut (private audience with the Rebbe).
When Rabbi Groner was told that the man would not be spending Yom Tov in 770, he told him that only those guests who spent Yom Tov in 770 could have yechidut. The man begged him for an appointment and was finally allotted five minutes.
When it was his turn and five minutes had gone by, Rabbi Groner went in to indicate that the man’s time was up. The Rebbe motioned that the man should stay. He finally left after fifteen minutes and he emotionally told Rabbi Groner what happened.
“Before I went in to see the Rebbe, I had prepared many topics that I wanted to discuss. When you told me that I had only five minutes, I picked three of the topics and wrote them on the note that I handed the Rebbe as soon as I walked in. The Rebbe read the note, looked up, and began discussing a topic that I hadn’t written. At first, I thought the Rebbe was continuing to talk about the topic he had discussed with the person who had yechidut before me. Then I suddenly remembered that I had wanted to discuss this topic with the Rebbe but had left it out. The Rebbe finished talking about that topic and went on to the next topic which, amazingly, was also one of the topics I had wanted to discuss. The Rebbe went from topic to topic, all of which I had wanted to discuss but hadn’t written in the note. My conclusion is – the Rebbe has ruach ha’kodesh (Divine inspiration)!”