Sonnet 116 by William Shakespeare explores the nature of true love, defining it as constant and unchanging despite external circumstances and the passage of time. The speaker asserts that authentic love withstands challenges and does not fade with beauty or time, boldly stating that if his definition is incorrect, true love itself cannot exist. This idealized portrayal of love remains relevant today, contrasting with modern, often transient relationships, and invites readers to reflect on the depth and permanence of their own romantic connections.