The heart is

"A three-chambered organ that was the center of vitality in the body" Aristoteles

 "[The heart is the] root of all faculties and gives the faculties of nutrition, life, apprehension, and movement to several other members." Avicena

"If indeed from the heart alone rise anger or passion, fear, terror, and sadness; if from it alone spring shame, delight, and joy, why should I say more?" Andreas de Laguna