“Diligence is quick to carry out what intelligence has lingered over. Fools are fond of hurry: they take no heed of obstacles and act incautiously. The wise usually fail through hesitation. Fools stop at nothing, the wise at everything. Sometimes things are judged correctly but go wrong out of inefficiency and neglect. Readiness is the mother of luck. It is a great deed to leave nothing for the morrow. A lofty motto: make haste slowly.”
Baltasar Gracian, S.J.
Note how Coach John Wooden borrowed that last phrase and Branch Rickey of the Dodgers used the luck and readiness idea.
The Art of Twenty-First Century Wisdom: An Internet Oracle 