Final answer:
St. Boniface learned from the early Christian saints' lives about their role as faith exemplars and divine intermediaries, St. Augustine's concept of earthly life's insignificance compared to heavenly salvation, and the emphasis on monastic communities' learning and missionary work for spreading Christianity.
Step-by-step explanation:
St. Boniface, by reading the lives of early Christian saints, learned the pivotal role of saints in medieval Christianity. Saints were not only seen as models of faith but also as intermediaries for the common people, who did not usually feel worthy of direct contact with the divine. They were advocates for individual communities and were perceived as caring beings who would intercede for their supplicants. Moreover, St. Augustine's profound approach towards the junction of Christian thought and classical learning taught that earthly life's significance pales in comparison to heavenly salvation, shaping the Christian belief system that influenced St. Boniface. Martin Luther's interpretation of faith shaping the fundamental Protestant belief in salvation by faith alone rather than by good deeds further shows the transformative impact of seminal Christian thinkers whose writings likely influenced St. Boniface.
Monastic communities became bastions of learning and economic powerhouses that meticulously preserved Christian theology and classical texts. These communities valued the pursuit of knowledge as a pathway to understanding the divine, echoing thoughts from the School of Chartres regarding the importance of studying ancient texts. St. Boniface would also have been aware of missionary work as a vital tool for expanding Christian beliefs, as demonstrated by significant Christian figures like Pope Gregory and Augustine of Canterbury.