How do we know God's chosen people are secure in salvation?

Jesus Christ affirms in John 6:39 that He will lose none of those whom the Father has given Him but will raise them up on the last day. This is a powerful indication of the security of God's chosen people. Their salvation is grounded in God's sovereign will rather than human efforts, affirming that real assurance comes from knowing that it is God who initiates, sustains, and concludes the process of salvation. Thus, those who are genuinely in Christ can rest assured of their final inheritance.