“In the midst of chaos, a book is the best thing you can hold on to.”
Related quotes

Source: You Shall Know Our Velocity!

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

“He who can listen to the music in the midst of noise can achieve great things.”
Quoted in "Vikram A. Sarabhai".
Source: Vikram Ambalal Sarabhai, 14 December 2013, New Mexico Museum of Space History http://www.nmspacemuseum.org/halloffame/detail.php?id=120,

“The best thing you can say is the thing that you have not uttered.”
All Will be Well (2004)

About the End of Allegiant (SPOILERS), Roth, Veronica, Veronica Roth, October 28, 2013, November 3, 2013 http://veronicarothbooks.blogspot.com/2013/10/about-end-of-allegiant-spoilers.html,
Quoted at:
Veronica Roth offers huge explanation for 'Allegiant's' big twist – will it appease you?, Sims, Andrew, Hypable, October 28, 2013, November 6, 2013 http://www.hypable.com/2013/10/28/allegiant-review-tris-dies-veronica-roth-response/,