1 Cor 1:8 He will also keep you firm to the end, so that you will be blameless on the day of our Lord Jesus Christ.
This statement is true in the context. It is true for all who trust in Jesus. Not a spurious faith but a loving and enduring faith. For these, the Lord will keep you for salvation. No difficulty or trial will overcome you.
He is preserving you for his prize. Eternal life is the goal of your persevering faith. Faith is persevering to love as he holds dear and this ensures the prize of love, friendship, inheritance, faithfulness and eternity to explore with him.