What does the Bible say about the impossibility of salvation?

In Luke 18, Jesus illustrates the impossibility of salvation through the encounter with the rich young ruler who believed he was righteous. When asked how to inherit eternal life, Jesus pointed out that it is easier for a camel to go through the eye of a needle than for a rich man to enter the kingdom of God. This demonstrates that salvation cannot be earned through moral effort or wealth; it is solely an act of God's grace. Only God has the power to change a person's heart and bring about repentance and faith. As Jesus says, 'The things which are impossible with men are possible with God,' emphasizing the necessity of divine intervention in our lives for salvation.