In "The Golden Sayings of Epictetus," the author presents a powerful reflection on the concept of invincibility. He suggests that true strength lies in the ability of an individual to remain undisturbed by external circumstances. Instead of being swayed by outside influences, a person who maintains control over their reasoned decisions embodies true resilience. This perspective emphasizes the role of internal choice as the foundation of personal empowerment.

Epictetus highlights that invincibility is not about being impervious to challenges, but rather about mastering one's reactions and choices. Those who can uphold their reasoned judgment in the face of adversity demonstrate a level of self-discipline and tranquility that sets them apart. Therefore, the capacity to remain unflappable as a result of steadfast reasoning is what defines an invincible person.