“Success in business requires training and discipline and hard work. But if you're not frightened by these things, the opportunities are just as great today as they ever were.”
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David Rockefeller 10
American banker and philanthropist 1915–2017Related quotes

Address to the British Association in Montreal (1884)
Context: Without encroaching upon grounds appertaining to the theologian and the philosopher, the domain of natural sciences is surely broad enough to satisfy the wildest ambition of its devotees. In other departments of human life and interest, true progress is rather an article of faith than a rational belief; but in science a retrograde movements is, from the nature of the case, almost impossible. Increasing knowledge brings with it increasing power, and great as are the triumphs of the present century, we may well believe that they are but a foretaste of what discovery and invention have yet in store for mankind. … The work may be hard, and the discipline severe; but the interest never fails, and great is the privilege of achievement.

2010s, Hard Truths: Law Enforcement (2015)

“Alex is an example for all of us. He works hard in training without ever speaking out.”
Adrian Mutu, Channel4.com http://www.channel4.com/sport/football_italia/janconts06.html

Discussing the death of his wife with Larry King, 2004.

“A culture of discipline is not a principle of business, it is a principle of greatness.”
Source: Good To Great And The Social Sectors, 2005, p. 1

Source: The Subtle Art of Not Giving a F*ck (2016), Chapter 9, “...And Then You Die” (p. 207)