"How Should We Then Live?" is a documentary series created by Francis Schaeffer that explores the impact of philosophical and cultural ideas on Western civilization. It examines the historical development of thought from ancient Greece to modern times, highlighting how these ideas have shaped society, morality, and art. The series emphasizes the importance of a coherent worldview, particularly from a Christian perspective, and encourages viewers to consider the implications of their beliefs on their lives and culture. Schaeffer argues that understanding our philosophical roots can help us navigate contemporary challenges and make informed choices about how to live.