"Every word of God proves true; He is a shield to those who take refuge in Him. Do not add to His words, lest He rebuke you and you be found a liar."
- Proverbs 30:5-6
God has a special zeal for sustaining the truth of His word. Robert Rollock explains, "God should be glorifed in the truth of His word. There is nothing the Lord seeks more than to be known in the truth of His word; and, therefore, look what He will do to be known to be true in His promise; rather than [that] His promises be not performed, He will invert the course of nature. The thing that the Lord hath once spoken will be performed, albeit all the world should say the contrary."
Rollock is referring to God's own assertions, such as that in Numbers 23:19: "God is not a man, that He should lie, or a son of man, that He should change His mind. Has He said, and will He not do it? Or has He spoken, and will He not fulfill it?" Yet, this understanding of Scripture, that it is actually the word of God, and therefore cannot contain error, is under attack. The ability of Christians to rest assured of the truth and love of God is actively denied, not just by professing unbelievers, but even by most members of mainline churches.
Rollock continues: "Men may lie, but God cannot lie. Ere He bring not about the thing that He hath spoken, He will mix the heaven and the earth together. He will bring things about against all the means in the world; not only by and above nature, but also contrary and against nature, as He brought the promise made to Abraham to pass. Nature can be no impediment, albeit a creature can do nothing against nature."
It is logically consistent for liberal Christians to deny the supernatural truth of the Bible, because they deny the supernatural nature of God. By demoting the infallible Deity to simply an exalted, yet fallible, glorified man, they are consistent in denying anything more in his word, than that is merely glorified literature. However, if one assumes a transcendent, omniscient deity, it is completely consistent to rely on what He says to be true and sure. It is on that basis that a true Christian can have confidence in the Bible, because its Author is reliable, in the ultimate and absolute sense, not in the momentary, passing, and unstable manner of a man.
An infallible God gives an inerrant Bible, in which a Christian finds comfort and assurance in the promises of that God in Jesus Christ. We can proclaim with the Apostle Paul, in II Timothy 3:16, "All Scripture is breathed out by God and profitable for teaching, for reproof, for correction, and for training in righteousness, that the man of God may be competent, equipped for every good work."