I saw him play Paul when he went back into the show (he returned for two full years, November '83 - '85, many people forget, McKechie's return almost a decade after the opening got more attn; they never played it again together, as she went back a full year later). He created the role, and his performance of the iconic speech was the most -- what's the word? -- unfettered. He simply let it happen. I remember being gobsmacked by the simplicity of the gathering emotion. It's an easy part to overcook, and his take was, to state the obvious, definitive.
"I'm a comedian, but in my spare time, things bother me." Garry Shandling