“Is Brooklyn in the house? Without a doubt, I'm the rapper with clout everybody yap about.”

Source: I Am Legend (1954), Ch. 2
Context: They were strange, the facts about them: their staying inside by day, their avoidance of garlic, their death by stake, their reputed fear of crosses, their supposed dread of mirrors.
Take that last, now. According to legend, they were invisible in mirrors, but he knew that was untrue. As untrue as the belief that they transformed themselves into bats. That was a superstition that logic, plus observation had easily disposed of. ‘It was equally foolish to believe that they could transform themselves into wolves. Without a doubt there were vampire dogs; he had seen and heard them outside his house at night. But they were only dogs.

2010s, 2015

The phrase has been used commonly for several decades, and there may be earlier sources. In a 1992 Business North Carolina article, Dooley noted about being an NFL referee that "If you're wrong, everybody in the world will tell you. If you're right, nobody cares. I'm not always right, but I'm never in doubt." Cf. the Free Library article http://www.thefreelibrary.com/Sundays,+he+turns+foul-mouthed.-a011823168.
Attributed

On the counterfeit gold record of her 1974 single "You and Me Against the World", as quoted in "Helen Reddy Sings Out for Women's Lib—but Jeffrey Calls the Tune" by Robert Windeler, People Magazines, 3 February 1975 http://people.com/archive/helen-reddy-sings-out-for-womens-lib-but-jeffrey-calls-the-tune-vol-3-no-4/

Farewell Address (1947)

The Man (2014).
Song lyrics

Source: The Courage to Create (1975), Ch. 1 : The Courage to Create, p. 21
Context: The relationship between commitment and doubt is by no means an antagonistic one. Commitment is healthiest when it is not without doubt but in spite of doubt.

As quoted in "I am the Champion" by Nick Ferrari in The Sun (19 July 1985) http://www.queenarchives.com/index.php?title=Freddie_Mercury_-_07-19-1985_-_The_Sun.
Context: I'm possessed by love — but isn't everybody? Most of my songs are love ballads and things to do with sadness and torture and pain.
In terms of love, you're not in control and I hate that feeling. I seem to write a lot of sad songs because I'm a very tragic person. But there's always an element of humour at the end.