In supporting argument for segregation, Paul [the apostol] addresses the people in his epistle to the Colossians, and he tells them how to treat their slaves. "Slaves, obey your masters. Masters, be kind to yourslaves. " Paul was in favor of a kinder and gentler slavery; it never occurred to him to raise the question about whether slavery itself was immoral.
We know nothing. And just because you know something to be true at this moment in your life or you feel that it is true, you can never be sure of yourself.