In plain and simple English this means hard work. Very hard work. There is no substitute for very hard work when it comes to success.
I have not known, heard of, or read about any individual anywhere who achieved real success without working extremely hard. In fact, the great successes we all know about are individuals who almost always have greatly outworked their competition.
Grantland Rice, a sportswriter and poet, understood this fundamental characteristic of achievement. He described it in his poem "How To Be a Champion."
"You wonder how they do it, You look to see the knack. You watch the foot in action, Or the shoulder of the back. But when you spot the answer, Where the higher glamours lurk, You'll find in moving higher, Up the laurel-covered spire, That most of it is practice, And the rest of it is work."
(Excerpt from Wooden: A Lifetime of Observations and Reflections)