"The Church has held from the beginning that the Bible is the Word of God in such a sense that its words, though written by men and bearing indelibly impressed upon them the marks of their human origin, were written, nevertheless, under such an influence of the Holy Ghost as to be also the words of God, the adequate expression of His mind and will. It has always recognized that this conception of co-authorship implies that the Spirit's superintendence extends to the choice of the words by the human authors (verbal inspiration, but not a mechanical dictation!) and preserves its product from everything inconsistent with a divine authorship—thus securing, among other things, that entire truthfulness which is everywhere presupposed in and asserted for Scripture by the biblical writers (inerrancy)."
"The doctrine of plenary inspiration (plenary=full, total, including all parts) holds that the original documents of the Bible were written by men, who, though permitted to exercise their own personalities and literary talents, yet wrote under the control and guidance of the Spirit of God, the result being in every word of the original documents a perfect and errorless recording of the exact message which God desired to give to man."
B.B. Warfield, The Inspiration and Authority of the Bible, p. 173