I was once speaking with the Rebbe, of blessed memory, and perceived that he very much wanted to reveal to me some perception he had attained, as he was wont to do. However, it was hard for him. I walked with the Rebbe in silence, because he said nothing at all to me. Even so, as we walked, the following words emerged from his holy mouth: “Se hatt a punim az mi mooz zikh foon a hirhur zei’er heatten – It appears that we must guard ourselves very carefully from immoral thoughts.”

From the holy language he used and the holy motions he made when saying this I could tell that an awesome insight had been revealed to him about the severity of an immoral thought, God forbid. It causes terrible harm; may the Compassionate One spare us.

However, it is impossible to put this into writing.