What does the Bible say about the futility of human endeavors?

In a theological framework, human endeavors are rendered futile when they attempt to achieve righteousness apart from God's sovereign grace. Isaiah 64:6 highlights this by explaining that even our righteous deeds are like filthy rags before God. This signals the profound truth that while humans may seek to build their kingdoms through effort, true blessing and acceptance must come from God’s initiative and mercy. The natural inclination of humanity is to trust in their works, but true faith requires casting aside any reliance on personal merit, acknowledging that all blessings flow from God alone.