Every human being is optimistic in their life, always thought that some changes will come in life. Life is always upon believe and hope. Without hope no-one can survive in life , every human being thought time will change because change is Nature strategy.
Time always running its own direction if night day will come sure this is natural fact. Hope to change in situation man man can live in life.
Optimistic thought is the key factor of life survival, so everyone rely that situation.