Man's perception that heart's work never stops, and that its rhythm and rate are susceptible to emotions and different life situations, has made the heart the most privileged organ. Since ancient times it has also become the most investigated organ. The first written and drawn traces for this can be found in drawings of ancient primitive people. They sacrificed human victims at the altar of their gods by extracting their beating hearts. The oldest knowledge about the heart is found on Ebers and Smith's papyrus of ancient Egyptians. In their mythology god Anubis, god of the dead and ruler of the underworld, weighs the heart of the deceased before letting him into the world of the dead. Ancient Chinamen attributed to each organ the properties of the elements in nature, and all organs are in the relation of friendliness or hostility. Thus, the heart is the organ of fire and is associated with summer. Yang and yin components are responsible for the heart's work. Aristotle advocated the primacy of the heart, claiming that the heart is the „place of inherent warmth“, while Hippocrates was the first to describe the anatomy of the heart in his work „De korde“. Galen reached the conclusion that the heart is the driver of blood. At autopsies the medieval physicians searched for the soul of the deceased in his heart. For Catholics the heart is the symbol of life, love, everything noble and beautiful that the man possesses.