How do we know that God uses people to save souls?

Scripture clearly teaches that salvation is fundamentally the work of God, as seen in Ephesians 2:10, where believers are described as God's workmanship created for good works. However, the Lord also employs human instruments in the process of salvation. Acts 26:18 illustrates that God calls upon people to turn others from the power of Satan to God, indicating that He uses our efforts and interactions to effect spiritual transformation. This duality of divine sovereignty and human responsibility underscores the collaborative nature of salvation. While God alone grants the grace necessary for salvation, He chooses to accomplish His purposes through the faithful actions and ministry of His people. Hence, Christians are encouraged to be active participants in God's redemptive work.