句子使用 that 引导的宾语从句解释 proves 的内容，not yet strong enough 准确表达了程度上的不足。
Life is but an instant; death is also a fleeting moment.
Whether it is success or failure, it ultimately depends on oneself.
Most people in the crowded world spend their lives merely jostling along, never knowing where the place they truly want to reach is. However, those with goals never forget their direction, allowing them to find a way and walk toward success.
A single failure only proves that our determination for success is not yet strong enough.
Without great character, there are no great people, nor even great artists or great doers.
人生不过是一瞬间的事，死亡也是一刹那之间。
无论成功还是失败，归根结底都取决于自己。
多数人在人潮汹涌的世间，白白挤了一生，从来不知道哪里才是他所想要到达的地方；而有目标的人却始终不忘记自己的方向，所以他能打开出路，走向成功。
一次失败，只是证明我们成功的决心还不够坚强。
没有伟大的品格，就没有伟大的人，甚至也没有伟大的艺术家，伟大的行动者。
"When you feel like you can't go on, reflect on how far you've come."
"Confidence is a dynamic process that requires continual development and reinforcement."
"Perseverance is an essential quality for every successful person to overcome failure."
"No matter how large or small one's ambition, as long as one does their best and remains steadfast, they will surely achieve their desires."
"Winners never quit, and quitters never win."