How do we know that believers are secure in God's hand?

Believers are guaranteed security in God's hand according to John 10:28, where Jesus states, 'And I give unto them eternal life; and they shall never perish, neither shall any man pluck them out of my hand.' This promise of being safely held indicates that once a person is a believer, their eternal destiny is secured by both the Father and the Son. Furthermore, Deuteronomy 33:3 affirms this truth by declaring that all saints are in His hand, emphasizing that there is no power that can separate them from God's love. Thus, the security of believers is firmly rooted in the assurance of God's eternal promises.