Dilexit Nos §3

³ In classical Greek, the word kardía denotes the inmost part of human beings, animals and plants. For Homer, it indicates not only the centre of the body, but also the human soul and spirit. In the Iliad, thoughts and feelings proceed from the heart and are closely bound one to another. The heart appears as the locus of desire and the place where important decisions take shape. In Plato, the heart serves, as it were, to unite the rational and instinctive aspects of the person, since the impulses of both the higher faculties and the passions were thought to pass through the veins that converge in the heart. From ancient times, then, there has been an appreciation of the fact that human beings are not simply a sum of different skills, but a unity of body and soul with a coordinating centre that provides a backdrop of meaning and direction to all that a person experiences.