Ours is not to reason why; ours is but to do and die

Ours is not to reason why; ours is but to do and die is a proverb. A proverb is a short, common saying or phrase that may be a famous quote, an inspirational quote, an epigram, or the topic of a parable. These common sayings are language tools or figures of speech that particularly give advice […]
from Grammarist
https://grammarist.com/proverb/ours-is-not-to-reason-why-ours-is-but-to-do-and-die/