将以下英文句子翻译成中文。
"I have a dream that one day this nation will rise up and live out the true meaning of its creed: 'We hold these truths to be self-evident: that all men are created equal.'"
我有一个梦想，有一天这个国家将振奋起来，实践其信条的真正意义：“我们认为这些真理是不证自明的，即所有人生来平等。”