Some people try to draw parallels between Epicurean philosophy and Ayn Rand's objectivism. I would argue that they are very wrong to do so, but as an exercise in discussing how, I would pose this question: Rand was recorded to have said that she could present the essence of her philosophy while standing on one foot. Her summary was:
- Metaphysics: Objective Reality
- Epistemology: Reason
- Ethics: Self-interest
- Politics: Capitalism
Let's presume you are a stand-in for Epicurus or Metrodorus or Lucretius, and you were asked to give your statement of those four categories in one word or a very short phrase that conveys the essence of each.
Rand went on to elaborate slightly further at the link I am going to paste below. Her answers there might help you fine-tune your reply.
Note: I left the photo of Spock in the photo because I took it from a post that is several years old. In this instance Spock can serve as a reminder that Epicurus was not a Stoic/Vulcan, and Epicurus' answer would not be those of a Stoic or a Randian.