A small snip from this article by Fr.Michael Giesler that describes the unique community of early Christians:
"Above all, the early followers of Christ showed an understanding and
kindness to one another and to non-Christians that astounded the
ancient world—a world often constructed on power, money, and cruelty.
Though there were noble pagans who believed in personal discipline and
stoic acceptance of adversity, their virtue was based on human efforts
alone and often led to a feeling of sterility and helplessness.
But Christian fortitude had a twofold source. First, Christians were
aware of the grace that came to them from baptism, a grace which made
them children of God and gave them a power not dependent on human
efforts or lineage (cf. John 1:12). Second, they shared the conviction
that no Christian was isolated from another and that all of them—whether
rich or poor, noble or slave, educated or uneducated—were equally loved
and valued by Jesus Christ. Together the communities formed what the
Catholic Church would later call the Mystical Body of Christ, in which
each member, no matter how small, had an important contribution to make."