How do we know that salvation comes from the Lord?

In Jonah 2:9, Jonah declares, 'Salvation comes from the Lord,' encapsulating the foundational belief in sovereign grace theology that God is the sole source of salvation. This claim is further illustrated by Jonah's experience in the belly of the fish, where he realized that only God could rescue him from certain death. Similarly, throughout Scripture, we see the consistent message that humanity cannot save itself; it is entirely dependent on God's grace through Jesus Christ (Ephesians 2:8-9). This truth reassures believers that their salvation is securely rooted not in their merit or actions, but in God's sovereign will to save whom He chooses.