How do we know salvation is not based on human will?

The doctrine that salvation is not based on human will is firmly established in biblical teaching, especially in Romans 9:16, which states, 'So then it is not of him that willeth, nor of him that runneth, but of God that showeth mercy.' This passage clearly articulates that salvation is initiated and accomplished by God alone, thereby eliminating any notion that human decision or effort can contribute to our redemption. This is further supported by the idea that all people, in their natural state, are unable to seek God (Romans 3:10-12), necessitating God's sovereign grace to effectually call and save His elect.