His questing intelligence, along with his unflagging stamina and contentiousness, were by turns inspiring and intimidating, and it seemed that he might go on forever.
The unflagging energy of his melodic invention and rhythmic propulsion is always directed towards giving truthful expression to the text, and here it is as matchless as it is exciting.
Right up to his death, he remained an unflagging supporter of undergraduate performers, frequently attending events at which he was the only faculty member present.