Yes it is good for human life becoz this will help as to be mentally and physically strong
Mystery means some that is "left over" or "not still being found"... this mystery is good when people have curiosity to find it out and creates a positive impulse but when our life is left over as a mystery then it is not at all gooood!! hence there are two points of view of mystery of human life!!

thank u and please do comment for better answer the other time and mark as best if it's useful.. I may be answering late answering better is for sure!!