Final answer:
Augustine of Hippo heard a child's voice saying "take up and read," leading to his conversion to Christianity after reading a passage from the Bible that impacted him deeply.
Step-by-step explanation:
The phrase that Augustine heard during his conversion isn't explicitly provided in the reference texts you supplied. However, Augustine of Hippo famously heard a child's voice while he was in a garden, telling him to "take up and read," which led him to pick up the Bible and read a passage from Paul's Epistle to the Romans (Romans 13:13-14), which greatly impacted his conversion to Christianity. This moment is detailed in his confessional work 'Confessions' which narrates his spiritual journey.