Ray

Capitol, 1998
“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.–Wikipedia