不成熟的男人的标志是为了自己的事业英勇的死去，成熟的男人的标志是为了自己的事业卑微的活着。

上面的那个不是原文吧，和我找的完全不一样，而且意思也有错。

你的这句话是出自《麦田里的守望者》第24章，英文原文如下：
The mark of the immature man is that he wants to die nobly for a cause, while the mark of the mature man is that he wants to live humbly for one.

Immature men is a sign for his bravery in the cause of death, mature men is a sign for its own cause of the humble alive.