Source: How to Stop Worrying and Start Living
“The best preparation for tomorrow is to do today's work superbly well.”
As quoted in Lifetime Speaker's Encyclopedia (1962) by Jacob Morton Braude, p. 575.
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William Osler 50
Canadian pathologist, physician, educator, bibliophile, his… 1849–1919Related quotes

“The best preparation for tomorrow is doing your best today.”
Source: P.S. I Love You

“Preparation for tomorrow is hard work today.”

“You can do a few things superbly well, or a lot of things averagely well.”
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Speech at Founding Rally of the Organization of Afro-American Unity (28 June 1964), as quoted in By Any Means Necessary (1970)
By any means necessary: speeches, interviews, and a letter (1970)
Variant: The future belongs to those who prepare for it today.
Source: Malcolm X, Black Liberation, and the Road to Workers' Power
Context: Education is an important element in the struggle for human rights. It is the means to help our children and our people rediscover their identity and thereby increase their self respect. Education is our passport to the future, for tomorrow belongs only to the people who prepare for it today.

“Tomorrow will be like today. Life wastes itself whilst we are preparing to live.”
1840s, Essays: First Series (1841), Prudence

A Conversation with Ward Cunningham (2003), To Plan or Not To Plan
Context: To worry about tomorrow is to detract from your work today. Time you spend thinking about tomorrow is time you're not spending thinking about what to do today. The place you leave in the code because you think you'll need it tomorrow, is actually a waste of time today — and a liability tomorrow. It does more harm than good.