How do we know true faith is by grace?

The foundation of true faith lies in God's grace, which is the unmerited favor He bestows upon those He chooses. As highlighted in Genesis 6:8, Noah found grace in the eyes of the Lord, underscoring that his righteousness was not due to any intrinsic goodness but was a gift from God. The Scriptures declare that salvation is either by grace or by works; if it is by grace, it cannot be mixed with works (Romans 11:6). Thus, true faith originates from the sovereign initiative of God, reflecting the teachings of historic Reformed theology that emphasizes grace as the sole cause of salvation.