Final answer:
The author's voice in the excerpt is inspiring, demonstrated by the phrase 'never give in' which encourages perseverance and determination.
Step-by-step explanation:
The author's voice in the excerpt is inspiring. The phrase 'never give in, never give in, never, never, never, never–in nothing, great or small, large or petty - never give in except to convictions of honour and good sense.' exemplifies this voice. Churchill's speech at the Harrow School during World War II was meant to inspire and encourage the students to persevere and never surrender.