A year ago, Montag was in a park when he saw an old man in a black suit. For some reason, he thought about that man a lot. The man hid something in his suit, and when Montag sat down the old man leapt up, afraid and ready to run. Montag told him not to run. Montag then talked about the weather. It was a strange meeting, but one that Montag remembered vividly. The old man was a retired English professor who gave up his job forty years before when the last liberal arts college was closed for good due to a lack of students. They talked for an hour and
"...when an hour had passed he said something to Montag and Montag sensed it was a rhymeless poem. Then the old man grew even more courageous and said something else and that was a poem too." (pg 75)
The man he met was Faber. At the end of their conversation, Faber put his hand over his left coat pocket and,
".....Montag knew if he reached out, he might pull a book of poetry from the man's coat." (pg 75)
That is when Faber made the quote that interests you. He said,
"I don't talk things, sir,,,,,I talk the meaning of things. I sit here and know I'm alive." (pg 75)
In answer to your question, Faber in talking to Montag.