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"We can say with certainty - or 90% probability - that the new industries that are about to be born will have nothing to do with information."
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"Doubt is to certainty as neurosis is to psychosis. The neurotic is in doubt and has fears about persons and things; the psychotic has convictions and makes claims about them. In short, the neurotic has problems, the psychotic has solutions."

"A bird in hand is a certainty. But a bird in the bush may sing."

"No great deed is done by falterers who ask for certainty."

"That the sun will not rise tomorrow is no less intelligible a proposition, and implies no more contradiction, than the affirmation, that it will rise."

"Could we have prevented in 100% certainty? I don't think anything is that certain. However, we would have had a very, very good chance for preventing it."

"In these matters the only certainty is that nothing is certain."

"When we deal with questions relating to principles of law and their applications, we do not suddenly rise into a stratosphere of icy certainty."

"The minute one utters a certainty, the opposite comes to mind."
Explore more quotes by Peter Drucker

"The most efficient way to produce anything is to bring together under one management as many as possible of the activities needed to turn out the product."

"People who don't take risks generally make about two big mistakes a year. People who do take risks generally make about two big mistakes a year."

"Checking the results of a decision against its expectations shows executives what their strengths are, where they need to improve, and where they lack knowledge or information."
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