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In the very cold winter of 1979, Ayatollah Ruhollah Khomeini, the founder of the Islamic Republic of Iran, returned to Qom, the spiritual capital of the Shiite world, for the first time after his long exile. A huge crowd came out that day. As he made his way to the stage, passing through those who pressed together to see him, the ayatollah's mantle fell off. Once he had settled in his chair, he noticed how chilly he was. "I'm cold," he said. Within seconds, another mantle fell over his shoulders and wrapped him warm.

This mantle belonged to my father, Mohammad Taghi Khalaji. After my father draped his mantle over Ayatollah Khomeini's shoulders, he went to the podium and gave the introductory speech on behalf of the clerical establishment, as well as the people of Qom. I never...