One of the most powerful lines from Churchill's "Blood, Toil, Tears, and Sweat" speech is: "I have nothing to offer but blood, toil, tears, and sweat."
This line is powerful because it encapsulates the stark reality of the struggle ahead, conveying unyielding determination and the sacrifices that will be required. It sets a tone of honesty and resolve, rallying the nation to face adversity with courage and resilience.