The present study centers on the distinctive characteristics of Cicero's philosophical training; for the first time in a volume, the Roman philosopher's relationship with Epicurean philosophy is accurately recreated. Not only does Cicero exhibit his lofty philosophical proficiency anchored in the Academic school, but he also proves an excellent authority on Epicurus's proposed philosophy. At the conclusion of the research, of course, Cicero will prove to be a fierce opponent of Epicureanism - an intelligent adversary, capable of studiose dicere contra Epicurum: understanding and criticizing, but also (and this is surely quite important for us today) reiterating the opposing party's thought with great acumen. Epicureanism accordingly played a pivotal role in Cicero's philosophical development within the fields of physics, theology and ethics, paradoxically proving useful both in the formulation of a more skeptical and probabilistic philosophy and in the individuation of a path open to but even more strongly bound to Stoicism. Unyielding and dogmatically binding, Epicurus's doctrine endured throughout this dramatic historical moment situated at the end of the Roman Republic.