What does it mean to be kept by God's power?

In John 17:12, Jesus emphasizes the security of His followers by asserting, 'Those whom thou gavest me I have kept.' This references the doctrine of preservation, affirming that once God has chosen someone for salvation, they are eternally secure in Christ. It reassures believers that their faith does not rely on their own strength but on God's unwavering power to keep them safe from sin and separation from Him. This divine safeguarding is a profound comfort and encourages Christians to trust fully in God's faithfulness.