"Warm on the outside"
"I don't see a cold person when I look at you," Westaway said. "Although I guess I really don't know you all that well. What I do see, and see clearly, is one of the warmest persons I ever knew."
"I am warm on the outside, what people see. Warm eyes, warm face, warm fucking fake smile, but inside I am cold all the time, and full of lies. I am not what I seem to be; I am awful." The girl's voice remained steady, and as she spoke she smiled. Her pupils were large and mellow and without guile. "But, then, there's no other way. Is there?"
Philip K. Dick, A Scanner Darkly, 1977, pp. 256/257.
(See also "I see only murk. Murk outside; murk inside.".)