At the time when Thomas Aquinas, known as “the angelic doctor,” was applying Aristotelian principles to major theological issues, Ramon Llull, known as “the enlightened doctor” was writing about medicine in several of his famous works, such as Ars Magna [The Great Art] and Arbor Scientiae [The Tree of Knowledge]. These remarkable treatises expounded the “Lullian method” for the acquisition and mapping of knowledge, beautifully illustrated by the Tree of Knowledge that adorns the cover of this 10th anniversary issue of Dialogues in Cardiovascular Medicine....