Final answer:
Ambrose of Milan taught Augustine allegorical interpretation of Scripture, key to developing Christian doctrine and the idea that earthly life pales in significance to spiritual existence in heaven.
Step-by-step explanation:
Ambrose of Milan taught Augustine to interpret Scripture allegorically, moving beyond a literal interpretation towards understanding the spiritual and theological insights within. This method was crucial in allowing Augustine to reconcile Christian teachings with classical philosophy and his own intellectual doubts. This was particularly important for Augustine's development of Christian doctrine, where he emphasized the spiritual realm and the transient nature of earthly life in contrast to the eternal. Ambrose's interpretation methods influenced Augustine’s foundational thinking, notably visible in his works like The City of God and Confessions.
By introducing a metaphorical reading of Scripture, Ambrose provided a tool that was pivotal for Augustine's understanding of Christian texts, which helped shape medieval European philosophy and religious thought. The allegorical method underscored the belief that while everything God created was good, the material world is less significant compared to the spiritual journey towards God's heavenly kingdom. This approach to scripture laid a foundation for Christian theology, framing how humans should understand their existence and the material world's tribulations.