How do we know that salvation is impossible for man?

Jesus illustrates the impossibility of human salvation by stating 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 (Luke 18:25). This emphasizes that human efforts in achieving righteousness are futile. Salvation is indeed 'impossible with men,' as our sinful nature renders us incapable of meeting God's holy standards. This stark reality points us to the necessity of divine grace, which makes salvation possible through God's sovereign act in choosing to save, demonstrating that it is through God's power, not human merit, that one can attain eternal life (Luke 18:27).