Final answer:
The quote "Without Pain, How Could We Know Joy?" relates to Augustus's family's spirituality by emphasizing their stoic approach to adversity and their perseverance through difficult times.
Step-by-step explanation:
In The Fault in Our Stars, the quote "Without Pain, How Could We Know Joy?" relates to Augustus's family's spirituality by emphasizing their stoic approach to adversity and their perseverance through difficult times. Stoicism is a philosophical school of thought that values rational self-control and acceptance of fate. Augustus's family, particularly Augustus himself, demonstrate their ability to find happiness and joy despite the pain and challenges they face.