'Ineffective' in the Bible

What then? If some did not believe or were unfaithful [to God], their lack of belief will not nullify and make invalid the faithfulness of God and His word, will it?

We know that our old self [our human nature without the Holy Spirit] was nailed to the cross with Him, in order that our body of sin might be done away with, so that we would no longer be slaves to sin.

But are you willing to recognize, you foolish [spiritually shallow] person, that faith without [good] works is useless?