Eternal security is a doctrine of Scripture, a divine revelation of an abiding fact which exists, whether it is believed or not. Assurance is only the personal confidence in a present salvation. Now, God wants you to enjoy your salvation. He never lets go. Now sit back, relax, and enjoy your salvation.
Election gives assurance of salvation.
Eternal security is the truth that establishes a Christian in assurance of salvation. For the most part, what we are being taught on salvation assurance is clearly based on the foundation of OSAS, as just shown. We are told once a person has had a moment of true faith in Christ he is saved and will remain saved. Let's go to the Scriptures and find answers for these and other questions regarding assurance. God has given us eternal life, and this life is in his Son.