The difference between mystery, mystery and mystery in English

All three are mysterious. In layman's terms, they are all words that describe secrets. They usually mean: mysticism; He has a mysterious personality (his personality is mysterious/in layman's terms, he is a mystic at heart)

Mystery = mysterious, incomprehensible, vague, magical and mysterious; He likes to remain mysterious (he likes to remain mysterious)

Mystery = mystery, magic, mystery; Human anatomy remains mysterious to this day.