“There is, though, nothing that prepares us for the worst things in our life. There is nothing you can do to stop the shock, or buffer the pain.”

Source: One

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

Source: 1984

Source: The Final Testament of the Holy Bible

Source: The Miraculous Journey of Edward Tulane

On how to stay focused - "The Secret Of My Peace In The Storm - TB Joshua" http://www.nigerianmonitor.com/the-secret-of-my-peace-in-the-storm-t-b-joshua/ Nigerian Monitor (October 27 2014)
Variant: “When you are connected to your destiny, nothing and nothing can stop you.”

Source: Pride and Prejudice

Source: Sense and Sensibility