Throughout Hamlet, Hamlet expresses his thoughts via several soliloquies. His fourth soliloquy establishes the turning point within the play. This soliloquy takes place in Act 3, Scene 1. In this scene, Hamlet is being "set up" by Ophelia, Polonius, and Claudius. They are attempting to establish the extent of Hamlet's mental instability. They fear his "madness" is caused by his inability to express his love for Ophelia. In this scene, as Hamlet directly denies any love for Ophelia, which is contrary to the love he strongly conveys in previous scenes, readers realize that Hamlet is determined to keep the vow he made with the ghost of his father. .
Prior to Act 3, Scene 1, Hamlet's character is gradually developed primarily through the use of soliloquies. Readers watch Hamlet shed the vulnerable devastation he expresses in 1.2, take on a vengeful stance in 1.5, construct a methodological system in 2.2, and develop into a philosophical, unyielding character in 3.1. .
In Act 1, Scene 2, Hamlet is reacting to his mothers" hasty marriage to his uncle, Claudius. Hamlet is devastated that she could remarry after being widowed only two months. He makes references regarding the possibility of them having an adulterous relationship before his father's death. "Why, she would hang on him (Claudius) as if increase of appetite had grown by what it fed on; and yet within a month- Let me not think on't; fralty, thy name is woman- (Signet, 1.2, Lines 143-145, page 15)" Hamlet also expresses his displeasure of their relationship by referring to his mother's relationship with his uncle as "incestuous." At this junction in the play, one might suppose Hamlet is reacting in such a way that any typical individual would react to their mother remarrying so soon after the death of their father. A reader, not yet realizing that Claudius has killed the king, might regard Hamlet's strong emotions as remnants of grief from his father's death.