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A good rule of thumb for any hacker is to stay clear of any cardinal sin.
Lust - don't let your dick make any decisions for you
Greed - know when to stop
Sloth - go the extra mile or else it might bite you
Wrath - like lust, an emotion that can negatively influence your judgment
Pride - the best criminal and the perfect crime is the one nobody knows about, and overconfidence leads to errors.
Gluttony - excessive consumption raises suspicions
Envy - don't try to outdo someone else. He is known for a reason.
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-eth0

Pride! or Prejudice
the main one to watch out for is "Pride" as we all want to share our accomplishments, but as soon as we do we open ourselves up to blackmail and other undesirables, keep this in mind, as soon as you release some information, its out of your control.
The Attitude You Receive Is Proportional To Your Intelligence.
Prejudice (part 2)
Everyone is a prisoner of his own experiences. No one can eliminate prejudices - just recognize them.
It takes one to know one
OpiNian
Thats Right, but it is natural of human...
7 cardinal sins of a hacker
May be it depends on human nature but I think prejudices can not be eliminate but can be recognize and can be change according to a situation.
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Nice
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I agree with your thought
I agree with your thought that overconfidence leads you to errors. Being overconfident sometimes prove to be harmful. Pop art