Final answer:
The statement illustrates how the unity seen in divine entities can inform human interactions, advocating for a society founded on truth and love. As seen through history, the quest for a 'good' life and societal organization has been guided by varying ideals, but the essence lies in the balanced functioning of body, mind, spirit, and promoting collective well-being.
Step-by-step explanation:
The statement "There is a certain resemblance between the unity of divine persons and the fraternity that men are to establish among themselves in truth and love." provides a guide to full human living by suggesting that just as divine entities are unified in purpose and action, humans too should strive for harmony and cooperative existence. To live fully, humans must consider their three-part composition - body, mind, and spirit - and ensure that each part functions properly and in balance with the others.
Human fraternity is based on recognizing truth and engaging with love, concepts central to the moral philosophies explored through history. Before 500 BC, Greek societies sought guidance from gods and fate, while post-1800 Western societies emphasized adherence to God's will. Today, amidst the plurality and relativism of post-modern thought, the clarity of such guidance has diminished, yet the pursuit of happiness, as outlined in historical documents and philosophical thought, remains pertinent.
Ultimately, the guide to a good life and full human living requires a re-affirmation of our capability to reason and conquer nature, as well as the need for a society organized around the principles of equality, rights, and the pursuit of happiness for all individuals. In connecting to the divine through moral living, and promoting the well-being of each person, we live out the intended resemblance between divine unity and human fraternity.