“Doing the best at this moment puts you in the best place for the mext moment”
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Oprah Winfrey 143
American businesswoman, talk show host, actress, producer, … 1954Related quotes
The Four Agreements (1997)

As quoted by John M. Kost http://www.mackinac.org/bio.aspx?ID=104 (25 July 1995) in S. 946, the Information Technology Management Reform Act of 1995: hearing before the Subcommittee on Oversight of Government Management and the District of Columbia of the Committee on Governmental Affairs (1996).
This appears to derive from a 1910 advertisement by writer Alfred Henry Lewis for a forthcoming series of biographical articles about Roosevelt: "All activity, Mr. Roosevelt has often shown that it is better to do the wrong thing than do nothing at all. In politics this last is peculiarly true. The best thing is to do the right thing; the next best is to do the wrong thing; the worst thing of all things is to stand perfectly still". (e.g. in La Follette's Magazine https://books.google.com/books?id=RV4CAAAAIAAJ&pg=PA183&dq=%22best+thing%22+%22right+thing%22+%22worst+thing%22+nothing&hl=en&sa=X&ved=0ahUKEwjNksu-nZrMAhVDy2MKHSl1Df8Q6AEIIzAB#v=onepage&q=%22the%20best%20thing%20is%20to%20do%20the%20right%20thing%22&f=false (28 May 1910)
Disputed

“Poetry is the record of the best and happiest moments of the happiest and best minds.”
A Defence of Poetry http://www.bartleby.com/27/23.html (1821)

“In life the best moments teach you to appreciate it, the difficult you to face it.”
Original: Nella vita i momenti migliori ti insegnano ad apprezzarla, quelli difficili ad affrontarla.
Source: prevale.net

“He who is best prepared can best serve his moment of inspiration.”