One faith refers to the singular trust in Jesus Christ that all believers share, as the faith of God's elect.
In the context of Ephesians 4:5, the term 'one faith' signifies the shared belief and trust that all genuine believers place in Jesus Christ as their Lord and Savior. This faith is not based on human efforts or works but solely on God's grace and the redemptive work of Christ. It emphasizes the importance of a faith that does not include any additions or conditions based on human merit. The faith of God's elect hinges upon the assurance that salvation is entirely a work of the Lord, free from the influence of man. Hence, the unity of this faith is foundational to the identity of the Church, drawing believers from diverse backgrounds into one body under Christ.
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