John L. Dagg was a Baptist theologian who lived from 1794-1884. One of the books he wrote is his Manual of Theology: A Treatise on Christian Doctrine (1871).

He wrote this in the section- Origin and Authority of the Bible:

“It remains that the Bible must be either from heaven or from good men. So pure a stream cannot proceed from a corrupt fountain. If it be from good men, they will not willfully deceive us. Let us, then, look to the account they have given of its origin: “All Scripture is given by inspiration of God.” “The things that I write unto you are the commandments of the Lord.” “And so we have the prophetic word more firm to which ye do well to take heed, as to a lamp shining in a dark place, until the day dawn, and the morning star arise in your hearts; knowing this first, that no prophecy of Scripture is of private invention. For never, at any time, was prophecy brought by the will of man, but the holy men of God spake, as being moved by the Holy Ghost.”

It may, perhaps, be objected to the use of these quotations, that we permit the Bible to speak for itself; but this is no unprecedented procedure. If a stranger were passing through our neighborhood, and we were desirous to know whence he came, it would not be unnatural to propose the inquiry to the man himself. If there were about him marks of honest and simplicity of character, and if, after our most careful investigations, it should appear that he has no evil design to accomplish, and no interest to promote by deceiving us, we should rely on the information we derive from him. Such a stranger is the Bible; and why may we not rely on its testimony concerning itself? Nay, it is not a stranger. Though claiming a heavenly origin it has long dwelt on earth, and gone in and out among us, a familiar companion. We have been accustomed to hear its words; and have known them to be tried with every suspicion, and every scrutiny, and no falsehood has been detected. More, it has been among us as a teacher of truth and sincerity; and truth and sincerity have abounded just in proportion as its teachings have heeded. Old men of deceit have shrunk from its probings, and trembled at its threatenings; and young men have been taught by it to put away all lying and hypocrisy. Can it be that the Bible itself is a deceiver and impostor? Impossible! It must be, what it claims to be a book from heaven–the Book of God.” (John L. Dagg)

I am thankful that God has given us a book from heaven, the Book of God. It is true, it has been tried and tested, and it is transformational!