Difference between Must and Have to

[Zim22]

Before I have read Headway article, I thought, that "must" is used to express obligation comes from 'outside' world, and 'have to' from 'inside' world. But Headway says opposite. Who is right? I or Headway? :)

Text below is from Headway, where they explain when use 'must' and when 'have to'.

Have to expresses strong obligation. The obligation comes from 'outside' - perhaps a law, a rule at school or work, or someone in authority.
Examples:
1) Yo have to have a driving licence if you want to drive a car. (That's the law).
2) I have to start work at 8.00 (My company says I must.)
3) The doctor says I have to do more exercise.

Must expresses strong obligation. Generally, this obligation comes from 'inside' the speaker.
Examples:
1) I must get my hair cut. (I think this is necessary.)
2) You must see the Monet exhibition. It's wonderful.
3) You must give me a call when you're next in town.

[Alan]

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Hi Zim,

Both these modals express obligation and necessity. 'Must' usually expresses this from the speaker's point of view and 'have to' expresses the obligation and necessity from another person's (from another source).

This sentence shows both modals: I must say good bye now or I shall be late and my boss says I have to be back at work at 2 o'clock.

Alan
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English as a Second Language
You can read my ESL story Present Simple

[Imtiaz Hussain]

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Hi,
Thanks Mr, Allan I have also confused between those two words.I'm going to write few sentences please check It's right or wrong.
I must do that work within given time.
You have to be apologised for Your mistakes.
If I have made a mistake please tell me I really thank full to You.

[Zim22]

thank you very much! now I understand difference!