I have been informed that President [Spencer W.] Kimball is not very alert and perceptive nowadays-not "with it" in all matters. That seems a little difficult to believe in view of his trip to Latin America to dedicate the grounds for the temples in Peru and Chile.49 Nevertheless, that is what I have been told. I have been told also that President [Ezra Taft] Benson is ailing. The most vigorous person in Church Administration-the real power in the administration-I am told is [eighty-year-old] Elder [Mark E.] Petersen whose health is remarkably good. He is vigorous mentally and physically.
[Confessions of a Mormon historian : the diaries of Leonard J. Arrington, 1971-1997, Gary James Bergera, editor, Signature Books, 2018]