What does the Bible say about God's word and its authority?

The scripture emphasizes that the mouth of the Lord has spoken it, affirming the infallibility of Holy Scripture. This declaration assures us that the Bible is not merely a collection of thoughts or opinions; it is the very word of God, inspired, inerrant, and infallible. In 2 Timothy 3:16, we read that all Scripture is breathed out by God, making it profitable for teaching and correction. This means that the authority with which we preach the gospel is not derived from human wisdom or opinion but from the firm and unchangeable words that God has spoken.