John Macnab by John Buchan

The great doctor stood on the hearth-rug looking down at his friend who sprawled before him in an easy-chair. It was a hot day in early July, and the windows were closed and the blinds half-down to keep out the glare and the dust. The standing figure had bent shoulders, a massive clean-shaven face, and a keen interrogatory air, and might have passed his sixtieth birthday. He looked like a distinguished lawyer, who would soon leave his practice for the Bench. But it was the man in the chair who was the lawyer, a man who had left forty behind him, but was still on the pleasant side of fifty.

"I tell you for the tenth time that there's nothing the matter with you."