As Paul continues strengthening the churches that he has planted, Apollos, a Jewish Christian from Alexandria, enters the scene. After Aquilla and Priscilla help him understand the things of God more fully, Apollos leaves Ephesus and heads to Corinth. Upon arriving, Apollos greatly helped those who through grace had believed, namely by preaching Jesus and refuting false teachers. We learn in this passage at least two things about saving faith: 1) All those who have truly believed have believed through grace, 2) Those who have believed through grace need help.
In addition, we learn in other Scriptures that it is not only a work of God’s grace that we initially believe (Ephesians 2:8-9), but it is due to His ongoing grace that we keep believing (Jeremiah 32:40). All of this is due to Jesus, who died to overcome all our sin, bringing us into “the New Covenant in his blood” (Luke 22:20).