E. J. Young on necessary inerrancy

If one holds to limited inerrancy/infallibility, the Bible, as originally given, is taken to include truth and error, the words of God and the words of men. There are words written by inspiration, and words that were not under the direction of the Spirit so as to secure the total truthfulness of what was written. If one holds to plenary verbal inspiration, that "all Scripture" has been breathed out by God, so that the very words of the human authors are at the same time the words of God, a claim is being made not only about the truthfulness of the Bible but also about the nature of God. E. J. Young put it this way:

Whatever Word He has uttered, since it has come from His mouth, is true and trustworthy. 'The words of the Lord are pure words', the Psalmist declares, 'as silver tried in a furnace of earth purified seven times'. What has been spoken by God, who cannot lie, must be pure and true altogether. Every word which proceedeth from the mouth of the Heavenly Father must in the very nature of the case be absolutely free from error. If this is not so, God is not trustworthy.

If, therefore, the Scriptures are the Word of God, breathed out by Him, it follows that they too, are absolutely true and infallible.

E. J. Young, Thy Word is Truth, p. 40