What does the Bible say about our conduct as Christians?

In Galatians 2, Paul rebukes Peter for his conduct which was not in accordance with the truth of the gospel. Peter's actions—disassociating from Gentiles due to pressure from the Jews—sent a message contrary to the gospel that salvation is by grace, not by works of the law. This incident illustrates that our conduct has significant implications for others and must consistently reflect our belief that justification comes solely through faith in Jesus Christ. We are called to walk uprightly, meaning our lifestyles should mirror the grace by which we have been saved, affirming that faith and not law justifies us before God.