Hope is what keeps man going during even the toughest time, and it provides a glimmer in the darkness. When you feel hope then you believe that things will change for the better and your situation is not hopeless. If you lose all hope then you lose all reason for living and life is meaningless. Without any hope man would be lost, and our species would quickly die out and become extinct.
Who else is serving a God that never fails? At times in your life you have probably prayed hard for something and had your prayers left unanswered, but why were they not fulfilled? It was not because god failed, he never does, it was because what you prayed for was not right for you at that point in time. Each of us has a master plan for our life that is designed by god, and what we want right now may not be what we need. If something is right for you and it aligns with this plan then your prayers will be answered but if it is wrong then God knows this and will not answer. God brings hope to mankind, and his presence in your life never fails to bring joy and peace at a time when both of these qualities are in short supply. When you worship the one true Lord then you have a god who never fails, and who always looks out for your best interests behind the scenes even when you think he may not be listening.