What does 'peace be unto you' mean in a Christian context?

'Peace be unto you' is a declaration of Christ’s intent to bring His peace, which surpasses all understanding (Philippians 4:7), to His followers. This peace is not merely the absence of conflict but an inner tranquility that comes from reconciliation with God through Christ’s sacrifice. In John 20:19, when Jesus appears to His disciples after the resurrection, He reassures them with this greeting to alleviate their fears and remind them of His victory over death. Thus, believers today can rely on His promise of peace in their hearts, especially in times of turmoil or doubt.