How do we know God's choosing is unconditional?

In scripture, particularly seen in the account of the Ethiopian eunuch, we recognize that God's grace is unmerited and unconditional. God's act of choosing His people does not depend on human ability or righteousness. As stated in 1 Corinthians 1:26-29, God chooses the foolish and weak things of the world to confound the wise, proving that our salvation rests entirely on His sovereign grace. This underscores the belief that faith and salvation are gifts from God, and not the product of human action or will.