使用了 It is/was not... but... 的并列结构，清晰地对比了能力不足与缺乏动力两个概念。
An obscure young man won his first marathon championship and broke the world record.
After crossing the finish line, he was swarmed by reporters who kept asking, "How did you achieve such a remarkable result?" The young champion, panting heavily, replied: "Because, because there was a wolf behind me." Looking into the reporters' surprised and inquisitive eyes, he continued:
"Three years ago, I started training for long-distance running. The training base was surrounded by high mountains. Every day at 2 or 3 AM, my coach would wake me up to train among the ridges. Despite my best efforts, my progress was always slow."
"One early morning, while training, I suddenly heard the howling of a wolf behind me. It started as a few distant sounds, but quickly became urgent and close behind me. I knew I was being hunted, so I didn't even dare to look back; I ran for my life. That day, my performance was exceptional. Later, when the coach asked me the reason, I said I had heard a wolf. He said with deep meaning, 'It wasn't that you weren't capable, but that you lacked a wolf behind you.' I later learned that there was no wolf that morning; the sounds were made by my coach. Since then, I have always imagined a wolf chasing me during every session, which led to rapid improvement in my results. In today's race, I also imagined a wolf behind me. That is why I succeeded."
Sometimes, it is not our friends, but our enemies, who push us to the podium.
一位名不见经传的年轻人首次参加马拉松比赛，便夺得了冠军，并打破了世界纪录。
冲过终点后，记者们蜂拥而至，将他团团围住，不断追问：“你是如何取得如此优异成绩的？”年轻的冠军喘着粗气回答：“因为，因为我的身后有一只狼。”迎着记者们惊讶与探究的目光，他继续说道：
“三年前，我开始练习长跑。训练基地四周崇山峻岭，每天凌晨两三点钟，教练就叫我起床，在山岭间进行训练。尽管我倾尽全力，进步却始终缓慢。”
“直到有一天清晨，我在训练途中忽然听到身后传来狼的嚎叫。起初零星几声，似乎还很遥远，但很快变得急促，且就在我身后。我知道自己被一只狼盯上了，甚至不敢回头，只能拼命奔跑。那天的训练，我的成绩好得惊人。后来教练问我原因，我说是听到了狼叫。教练意味深长地说：‘原来不是你的问题，而是你身后缺少了一只狼。’后来我才得知，那天清晨根本没有任何狼，那声音是教练刻意发出的。从那以后，每次训练时，我都会想象身后有一只狼在追赶，成绩因此突飞猛进。今天参加这场比赛时，我依然想象身后有一只狼。所以我成功了。”
有时候，将我们送上领奖台的，往往不是朋友，而是恰恰是我们的敌人。