Epicurus developed his philosophy based on four different sources: Platonic lecturers of Athens, atomist doctrine of Democritus, septic views of Pyrrhus, and hedonist philosophy of Aristippus. Even though he was affected by all these philosophers, he was a strong critic of them. Unfortunately, he taught his ideas like dogmas and his school gained almost a semi-religious character. Thus, while the further contributions were restrained by this feature, the Epicurean philosophy became easy to be studied. Investigating only Epicurus’ personal philosophy is adequate for understanding the general conception of Epicurean school indeed.