Sure he that made us with such large discourse, / Looking before and after, gave us not / That capability and godlike reason / To fust in us unus'd.
Act IV, Scene 4 · Hamlet
Context
Continuing his soliloquy, Hamlet asserts that God gave humans reason and the ability to reflect on past and future, and that leaving this capacity unused would betray its divine purpose.
Analysis
'Fust' means to grow moldy or rot from disuse—an unglamorous, physical word that treats reason as if it were grain left in storage too long. By describing 'godlike reason' with a verb associated with decay and neglect, Hamlet turns an exalted human capacity into something perishable and shameful when wasted. The phrase 'large discourse, / Looking before and after' emphasizes the scope of human thought—our ability to plan and remember—which makes the image of it rotting unused feel like a betrayal of the divine gift itself.
Essay Tip
Support a thesis that Hamlet's self-reproach is rooted in waste rather than cowardice—he frames his inaction as letting a divine capacity spoil, which positions his guilt as spiritual and existential, not just about failing to complete a task.