Sense of Resonsibility

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   What gives a person a sense of responsibility, a sense of duty,
   a sense of "should", "ought to", "have to", "must"?  The
   Spanish word "deber" may give some insight into this question.
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   "to owe it to oneself" (Duff. Spanish for Beginners. p. 95).
   Can we say a person's sense of responsibility or duty comes as
   a feeling of "owing something to oneself", of doing something
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   of his inner self come from?  Why do some people have a lot
   stronger sense of responsibility and duty than other people do?
   What is the connection between this and the moral standards