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Life is a box of chocolates, Forrest, you never know what you're gonna get.
— Mrs. Gump ‧ Forrest Gump

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The comparison presents life as something whose contents cannot be known in advance, like a box of chocolates. Its emphasis is on uncertainty rather than a promise about the outcome. Addressing Forrest directly gives the broad observation the plain, personal shape of a familiar explanation.
Context reviewed