"私たちは皆悪夢を持っているが、私の悪夢は私が生きているものです。"

Simplified Meaning:

Everyone has things they are scared of or worries that keep them up at night. For most people, these fears stay in their minds and don't actually happen. However, for some people, the things they worry about actually become real. Imagine a student who always fears failure in school. Usually, this fear remains just a worry, but for this student, they might actually end up failing many of their tests. When fears turn into reality, life becomes much harder to handle. For example, someone could be afraid of losing their job. If they actually lose their job, they then have to deal with finding a new one and the stress of financial problems. This quote highlights that while everyone has fears, some people end up facing them in real life. To apply this idea, it's important to handle worries constructively. If you are scared of something, try to take steps to prevent it from becoming real. For instance, if you fear failing a test, study hard and prepare well in advance to avoid the nightmares from coming true.