Suppose you are lost, you don't know where you are and walking down a street. You want to walk down this street as far as you can but you are also scared because you don't know what's ahead. It could be a deadend and you would lose all your energy for nothing. Moreover, you notice all the signs along the way and have the feeling that it is a deadend, you ask others along the way about the way you're going and all say the they think it is a deadend. But the fact that you are not 100% (maybe 90%) sure that it is, hoping for that small 10% it will not be a deadend. Should you continue walking with faith for something that possibly will not happen or should you stop and turn back now and not know forever that it is a deadend?

 

Optimistic is a great quality to have but it could also be a very dangerous one too. Have to be very careful using it.