“The Vammika Sutta likens skeptical doubt to a fork in the road. Say a traveler who is carrying many valuables arrives at a fork in the road; if he lingers there unable to decide which way to take, robbers may catch and possibly kill him. In the same way, a doubtful meditator who falls prey to wavering and procrastination cannot continue on with practice. He or she will then become a victim of mental defilements and be unable to escape the cycle of suffering. Only when he or she abandons doubt by noting it and uninterruptedly continues the practice can he or she be liberated from the cycle of suffering.”
Source: Manual of Insight (1945), p. 64
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Mahasi Sayadaw 13
Burmese Buddhist philosopher 1904–1982Related quotes

“When you come to a fork in the road, take it.”
When You Come to a Fork in the Road, Take It!: Inspiration and Wisdom from One of Baseball's Greatest Heroes, Hyperion, 2002, ISBN 0786867752, p. 1
Also in What Time Is It? You Mean Now?: Advice for Life from the Zennest Master of Them All, Simon and Schuster, 2003, ISBN 0743244532, p. 33
Berra says this is part of driving directions to his house in Montclair, New Jersey. There is a fork in the road, and whichever way you take, you will get to his house.
Found in newspapers from as early as 1913. The earliest known published evidence connecting the saying with Berra is from 1988. See http://quoteinvestigator.com/2013/07/25/fork-road/
Disputed, Misattributed
Jeff McMahan, " The Meat Eaters https://opinionator.blogs.nytimes.com/2010/09/19/the-meat-eaters/", The New York Times, 19 Sept. 2010

“Do not doubt him who tells you he is afraid, but be afraid of him who tells you he has no doubts.”
Original German text: "Zweifle nicht an dem der dir sagt er hat Angst, aber hab Angst vor dem der dir sagt, er kennt keinen Zweifel."
from "100 Gedichte ohne Vaterland", pub. 1978.

“The road to resolution lies by doubt:
The next way home's the farthest way about.”
Book IV, no. 2, Epigram.
Emblems (1635)

As quoted in "Pope Francis: Donald Trump 'is not Christian'", by Rebecca Kaplan, CBS News (18 February 2016) http://www.cbsnews.com/news/pope-francis-trump-is-not-christian/
2010s, 2016, Visit to Mexico (February 2016)

http://www.guardian.co.uk/football/2009/apr/22/paul-scholes-tributes-600-games-manchester-united
Thierry Henry, World Cup winning France forward