勇於挑戰的英文名言有：
1. Dare to challenge, never to yield! - 敢於挑戰，永不言敗。
2. Challenge is the way of life. - 挑戰是生活的途徑。
3. Challenge yourself, and you will challenge others, and life becomes more interesting. - 挑戰自己，就會挑戰別人，生活也會變得更加有趣。
4. Challenge is the key to success. - 挑戰是成功的關鍵。
5. Courage is required to challenge the unknown. - 挑戰未知需要勇氣。
6. The best way to predict the future is to invent it and challenge it. - 預測未來的最好方法就是去創造未來並挑戰它。
7. It is only when we are challenged that we discover our limits. - 只有當我們受到挑戰時，我們才能發現自己的極限。
希望這些名言能夠幫助到你！