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.

from Catcher in the Rye
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Gender-inclusive version:

The mark of the immature person is that he or she wants to die nobly for a cause, while the mark of the mature person is that he or she wants to live humbly for one.

from Catcher in the Rye