Why ?

Life always isn't the way we perceive it.Every crest has a trough & every trough looks forward to a crest.There are constant times when we are either on falling or on rising curves of this sinusoidal wave of life .And it happens in every man's life.None of us are an exception to this rule.I know when in distress we must take it as a grace from the lord.But does the mind understand inspite of the repeated positive churning in ?.What lies beneath the fragile human life & happiness is definitely an astounding mystery.We all live under this hazy theory which still demands a striking elucidation.Looks like this still remains as one unprobed area where man is unable to comprehend things beyond his reach & realisation though he has reasons of why and what,sometimes.Probably being a true non-atheist I would say this is where god draws a line of demarcation between him and his creations.If man was able to comprehend all that happens in his life then y do we have a god?