“I have ways of making money that you know nothing of.”
As quoted by Isaac Hewitt (1879) in testimony to the New York Assembly. Rockefeller doubted that he said this, according to John D. : The Founding Father of the Rockefellers (1980) by David Freeman Hawke; this is reminiscent of the remark attributed to Jesus in John 4:32: "I have meat to eat that ye know not of." (KJV)/"I have food to eat that you know nothing about." (NIV)
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John D. Rockefeller 29
American business magnate and philanthropist 1839–1937Related quotes

Random Reminiscences of Men and Events (1906)

“I know how to make money and I'll make it.”
From an interview with the "Tennesseean" newspaper reporter Robert K. Oermann in 1991.
Interview – Johannes Roberts https://crypticrock.com/interview-johannes-roberts/ (March 7, 2018)

(2010) http://www.independent.co.uk/sport/football/premier-league/wenger-hopes-record-profits-prove-his-wisdom-2089020.html
Arsenal (1996–present)

Source: Short fiction, Companions on the Road (1975), Chapter 9, “The Dark” (p. 98)
Source: True Grit (1968), Chapter 7, pp. 214-215 : thoughts of 'Mattie Ross'