Just like other living species, the abilities of human beings must also be limited. Ants in an ant colony do not move away more than a few meters. Some animals travel a few kilo meters searching food. Birds travel much more, some even a few thousand kilo meters. Human species have a much larger range for exploration. However, it is not unlimited. To imagine that we can achieve everything we can think of is a form of illusion. This is not any negative thinking, this realization can save a lot of unnecessary and wasteful spending by us.