William Shakespeare's Sonnet Philosophy Volume 3 (Second Edition 2019) considers Shakespeare's plays and poems from the vantage of his 1609 Sonnet philosophy. The nine plays and poems illustrate the ubiquity of his nature-based philosophy from its early articulation in the long poems Venus and Adonis and Lucrece before considering a play of his own devising Love's Labour's Lost and the short poem The Phoenix and the Turtle. Then follow Measure for Measure and the 1609 poem A Lover's Complaint before commentaries on the Tragedy Macbeth, the History Henry VIII and the Comedy Twelfth Night. Using their inherent philosophy obviates traditional speculation about authorship, assigning parts to other dramatists, and thousands of unnecessary emendations and alterations.