Sometimes erroneously prepended to the opening line "The art of war is of vital importance to the State", but appears to be a variation of the Roman motto "Si vis pacem, para bellum". It is not clear who first misattributed this phrase to Sun Tzu. The earliest appearance of the phrase in Google Books is 1920, when it appeared in a pharmaceutical journal, but no attribution was given then.
More quotes by Sun Tzu
Secret operations are essential in war; upon them the army relies to make its every move.
Management of many is the same as management of few. It is a matter of organization.
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Attribution
Quote text and notes from Wikiquote: Sun Tzu (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.