以下是樂觀的英文名言：
1. "Keep a sunny mind, live a happy life." —— Ralph Waldo Emerson
2. "What you think, you become. What you believe, you will have. What you imagine, you make real." —— Buddha
3. "Optimism is the faith that leads to achievement. Nothing can be done without hope and confidence." —— Dale Carnegie
4. "Behind every great fortune, there's a bad day." But that bad day doesn't have to make you feel like everything's gone wrong. Look for the silver lining.
5. "A positive attitude may not solve all your problems, but it will annoy everyone enough to solve one."
以上這些名言都表達了樂觀對於生活的重要性，以及保持樂觀心態的方法。