The psychologist and sceptic, Richard Wiseman, wrote a book called 'The Luck Factor' where he tried to analyse what behaviours made people more lucky. One of the factors was whether people 'looked on the bright side' so that when bad things happened to them, they would, for example, comfort themselves that it could have been worse (because it can always be worse

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I believe that this is part of keeping yourself open to new possibilities, which is a useful thing to have if you want to end up being successful in those possibilities. Gratitude, IMO, is one method for accessing this.
Incidentally, one of his factors was 'use your intuition', which he implied was about picking up subconscious cues that we get from our environment, including from other people. He then goes on to give a classic example of a guy who listened to his intuition and didn't get on a plane, which then crashed. What mundane environmental cues did that guy get?

Clearly, this was a magical experience, but Wiseman only says 'intuition' without saying 'hang on a minute'
