Works-based salvation is a belief as old as sin. Mankind’s first stratagem to make things right for themselves was to sew leaves together to hide the nakedness sin had exposed. This is the works of the flesh endeavoring to produce spiritual respectability. Their next act was to hide from God when He came to meet them so He wouldn’t discover their nakedness. Note the order, sin consciousness led to acts of self-righteousness that allayed the shame between husband and wife, but gave no relief in the presence of God.