The gift of eternal life is available to all who believe, with no catches or exceptions. Assurance of salvation comes from understanding eternal security, which is God's guarantee that the gift of eternal life, once received, is forever and cannot be lost. People often doubt their salvation due to various reasons, but the Bible provides four bases for absolute unwavering assurance: the powerful, unchanging promises of Almighty God, the unconditional love of God, the finished work of Jesus on the cross, and the witness of the Holy Spirit within us.
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