What's past is prologue
"What's past is prologue" is a quotation by William Shakespeare from his play The Tempest. The phrase was originally used in The Tempest, Act 2, Scene I. Antonio uses it to suggest that all that has happened before that time, the "past", has led Sebastian and himself to this opportunity to do what they are about to do: commit murder, or make another choice.
In contemporary use, the phrase stands for the idea that history sets the context for the present. The quotation is engraved on the National Archives Building in Washington, DC, and is commonly used by the military when discussing the similarities between war throughout history.
The phrase was originally used in The Tempest, Act 2, Scene I. Antonio uses it to suggest that all that has happened before that time, the "past," has led Sebastian and himself to this opportunity to do what they are about to do: commit murder. In the context of the preceding and next lines, "(And by that destiny) to perform an act, Whereof what's past is prologue; what to come, In yours and my discharge," Antonio is in essence rationalizing to Sebastian and the audience that he and Sebastian are fated to act by all that has led up to that moment, the past has set the stage for their next act, as a prologue does in a play. It can also be taken to mean that everything up until now has merely set the stage for Antonio and Sebastian to make their own destinies.
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- Respectfully Quoted: A Dictionary of Quotations. 1989. NUMBER: 1296
- The Past as Prologue? A History of U.S. Counterinsurgency Policy in Colombia, 1958-66 
- Murray, Williamson The Past as Prologue: The Importance of History to the Military Profession Cambridge University Press; 1 edition (May 8, 2006)
- "Replied Biden: "Past is prologue." He went on to defend his emphasis on the Bush policies often supported by McCain." 'In debate, both candidates accomplished their primary missions' Miami Herald 10.03.08