How do we know that salvation cannot be bought?

Salvation is a matter of grace, as articulated in Psalm 49:6-8, where it is clearly stated that none can redeem their brother or give God a ransom for their soul. Wealth cannot secure redemption; it is only through the blood of Christ that one can be saved. This aligns with the Reformed understanding that salvation is entirely by God's grace and hinges upon His sovereign will, not human effort or financial means. Riches may entice false security and a reliance on self, but true salvation is a gift that cannot be earned.