As I Heard Them, Vol. 1, pp. 54-55, no. 34
Reb Groinem, the mashpia in Lubavitch, told how one Simchas Torah, when they called the Alter Rebbe to re-cite the pesukim of Atah Horeisah, they used the terms: "Adoneinu Moreinu VeRabbeinu – Our Master, Teacher and Rabbi." The Rebbe's face glowed, so, later on they repeated the phrase.
The next day they overheard the Rebbe pacing in his room. "Adoneinu Moreinu VeRabbeinu, Adoneinu Mor-einu VeRabbeinu" he repeated bitterly, again and again. "If I had had a pit I would have buried myself alive."
"What's this?" they later asked him. "Everyone saw the Rebbe's face light up!"
"When afflictions are sent from Heaven, we must ac-cept them with love," came the answer.