How do we know that God will prevent apostasy in believers?

The assurance against apostasy hinges on understanding the roles of the Father, Son, and Holy Spirit in keeping the believer. God the Father keeps believers by His power, which upholds the universe. God the Son declares that no one can snatch His sheep from His hand, emphasizing His protective engagement. Finally, God the Holy Spirit actively intervenes in moments of temptation and trial. These roles collectively form a 'threefold cord' that signifies the strength of the believer's security in Christ.