What is the difference in being alone with another and being alone by ones self - "Henrik Ibsen"

What is the difference in being alone with another and being alone by ones self
Henrik Ibsen

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This is life! It can harden and it can exalt!
- Henrik Ibsen
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Its not only what we have inherited from our father and mother that walks in us. Its all sorts of dead ideas and lifeless old beliefs and so forth. They have no vitality but they cling to us all the same and we cant get rid of them.
- Henrik Ibsen