I have a memory. Haj Mirza Mohammad Ali Damghani who lived at the time when there was tyranny and in Hamedan he used to conduct the Friday pray told me that. He said: in one-year Haj Mr. Rouhollah had come to Hamedan. He was my guest for two to three nights. I remember that after he ate dinner he studied until the morning call to prayer; so much that once I told him; Haj Mr. since you do not sleep at nights there is not flesh in your legs. Rest some. Imam said: now that I am young I can go after my affairs; there will be a time during which I cannot go after my affairs. So right now I should use the opportunity.
Source: the book a ray of the sun, p. 133, a memory of Dr. Seyed Kazem Akrami