Final answer:
Phi Delta Theta's open motto is "Eis Anēr Oudeis Anēr," which means "One man is no man," emphasizing the importance of communal effort and fraternal values. Society's centered on the unquenchable thirst for personal development, and the lifelong values of friendship, sound learning, and rectitude.
Step-by-step explanation:
The Phi Delta Theta fraternity's open motto is "Eis Anēr Oudeis Anēr," which translates to "One man is no man" in English. This motto emphasizes the importance of brotherhood, community, and working together towards common goals within the fraternity. It represents the organization's values and the idea that each member is part of something larger than themselves, contributing to the development and betterment of all its members.