“For example, the dwarfs found out how to turn lead into gold by doing it the hard way. The difference between that and the easy way is that the hard way works.”
Source: The Truth
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Terry Pratchett 796
English author 1948–2015Related quotes

Source: Priest receives top environmental award https://www.ucanews.com/news/priest-receives-top-environmental-award/52279 (6 June 2012)

“Long is the way and hard, that out of Hell leads up to light.”
Source: Paradise Lost

“There are no easy choices. The way ahead will be very hard.”
"General Petraeus’s Opening Statement" (23 January 2007) http://www.nytimes.com/2007/01/23/world/middleeast/24petraeustextcnd.html?_r=1&pagewanted=all
Context: There are no easy choices. The way ahead will be very hard. Progress will require determination and difficult U. S. and Iraqi actions, especially the latter, as ultimately the outcome will be determined by the Iraqis. But hard is not hopeless, and if confirmed, I pledge to do my utmost to lead our wonderful men and women in uniform and those of our coalition partners in Iraq as we endeavor to help the Iraqis make the most of the opportunity our soldiers, sailors, airmen and Marines have given to them.

“Choose a lazy person to do a hard job. Because a lazy person will find an easy way to do it.”
Sometimes quoted with "difficult" instead of "hard".
A similar thought was expressed by automobile executive Clarence Bleicher in 1947 (before Bill Gates was born): "if you get a tough job, one that is hard, and you haven’t got a way to make it easy, put a lazy man on it, and after 10 days he will have an easy way to do it".
Misattributed
Source: http://quoteinvestigator.com/2014/02/26/lazy-job/

“The only way to do the best you can is to work as hard as you can.”
https://www.youtube.com/watch?v=xL5walAO3KI&feature=youtu.be&t=15m
Leader of the Opposition