Heart knowledge has evolved over time rather slowly and often has forgotten what the ancients already understood about the function and nature of the human heart. Modern science is only slightly further along in a comprehensive understanding of the cosmic significance of the human heart and its nature as a supersensible organ of perception.
The ancients had the advantage of being clairvoyant and could “see” what was actually happening in the heart. They used archaic images and descriptions of heart functions and pointed at mysteries concerning the ultimate nature of the heart.
They placed the heart above all else in the grand picture of human evolution. Following this path through history is quite instructive and demonstrates that the ancients may have used poetic language to describe the heart, but their insights were just as useful now as they were then.