The nature of faith is acceptance on the basis of testimony, and the ground of faith is therefore testimony or evidence. In this matter it is the evidence God has provided, and God provides the evidence in his Word, and the witness the Bible itself bears to the fact that it is God’s Word, and our faith that it is infallible must rest upon no other basis than the witness the Bible bears to this fact. If the Bible does not witness to its own infallibility, then we have no right to believe that it is infallible. If it does bear witness to its infallibility then our faith in it must rest upon that witness, however much difficulty may be entertained with belief. If this position with respect to the ground of faith in Scripture is abandoned, then appeal to the Bible for the ground of faith in any other doctrine must also be abandoned.
John Murray, “The Attestation of Scripture”, The Infallible Word, ed. by N. B. Stonehouse and Paul Woolley (The Presbyterian Guardian, 1946), pp. 7-8.