“The only person I know, is the person I want to be”
Source: The 7 Habits of Highly Effective People: Powerful Lessons in Personal Change
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Stephen R. Covey 125
American educator, author, businessman and motivational spe… 1932–2012Related quotes
Source: Does My Head Look Big In This?

“I am the only person in the world I should like to know thoroughly.”
Mr. Dumby, Act II
Lady Windermere's Fan (1892)

“I am mystified. I know only one person who voted for Nixon.”
Attributed to Kael after the 1972 American Presidential election, which Nixon won easily. This misquote is presumably based on "I live in a rather special world." above, but there is no evidence that Kael was mystified or surprised by that election's outcome.
Misattributed

“I fell in love with the right person, a person I know and who knows me.”
Of his wife
Interview with Oprah Winfrey

“I began by acting like the person I wanted to be, and eventually I became that person.”

“You know, I look like a duck. I just do. And I'm not the only person who thinks that.”
People magazine (1990) http://www.people.com/people/archive/article/0,,20128142,00.html
Context: You know, I look like a duck. I just do. And I'm not the only person who thinks that. It's the way my mouth sort of curls up or my nose tilts up. I should have played Howard the Duck.