I'm not sure here. The negative person gives up...no water, no hope, and he dies in the desert, while being buried by shifting sand.Results come from productivity and require resources, ....usually of something tangible. Positive thinking cannot substitute for tangible, feasible, real, solutions to problems. Believe you can overcome anything, ..be as positive as you like, ...know the difference.
Positive thinking while in the middle of a hot dry desert with an 11 day walk to water, a 3 day supply of it, and a broken leg, ..is useless. Unless someone comes to bail you out, you are most likely going to die, ..regardless of however you may feel about it.
The positive person thinks about a night with his GF after a few cold refreshing beers. He then starts walking with hope and desire...he's got a purpose driven life. He is eventually spotted by a search team, given water, and taken to his GF who is wearing a thong and just happens to have a few cold ones on ice back at their room at the Paradise Resort.
The moral of the story...the positive guy gets the beer and girl while the negative person gets nothing but sand.