sola scriptura = human reason alone

This remarkable set of paragraphs point out something interesting. Although it speaks to the so-called "rationalist" and compares this to the faith of the Church, I think it also reveals something else, perhaps beyond what was intended, but true none the less.


Leo XIII
SAPIENTIAE CHRISTIANAE
ON CHRISTIANS AS CITIZENS
http://www.papalencyclicals.net/Leo13/l13sapie.htm

20. In the case of those who profess to take reason as their sole guide, there would hardly be found, if, indeed, there ever could be found, unity of doctrine. Indeed, the art of knowing things as they really are is exceedingly difficult; moreover, the mind of man is by nature feeble and drawn this way and that by a variety of opinions, and not seldom led astray by impressions coming from without; and, furthermore, the influence of the passions oftentimes takes away, or certainly at least diminishes, the capacity for grasping the truth. On this account, in controlling State affairs means are often used to keep those together by force who cannot agree in their way of thinking.

21. It happens far otherwise with Christians; they receive their rule of faith from the Church, by whose authority and under whose guidance they are conscious that they have beyond question attained to truth. Consequently, as the Church is one, because Jesus Christ is one, so throughout the whole Christian world there is, and ought to be, but one doctrine: "One Lord, one faith;"[22] "but having the same spirit of faith,"[23] they possess the saving principle whence proceed spontaneously one and the same will in all, and one and the same tenor of action.

22. Now, as the Apostle Paul urges, this unanimity ought to be perfect. Christian faith reposes not on human but on divine authority, for what God has revealed "we believe not on account of the intrinsic evidence of the truth perceived by the natural light of our reason, but on account of the authority of God revealing, who cannot be deceived nor Himself deceive."[24] It follows as a consequence that whatever things are manifestly revealed by God we must receive with a similar and equal assent. To refuse to believe any one of them is equivalent to rejecting them all, for those at once destroy the very groundwork of faith who deny that God has spoken to men, or who bring into doubt His infinite truth and wisdom. To determine, however, which are the doctrines divinely revealed belongs to the teaching Church, to whom God has entrusted the safekeeping and interpretation of His utterances. But the supreme teacher in the Church is the Roman Pontiff. Union of minds, therefore, requires, together with a perfect accord in the one faith, complete submission and obedience of will to the Church and to the Roman Pontiff, as to God Himself. This obedience should, however, be perfect, because it is enjoined by faith itself, and has this in common with faith, that it cannot be given in shreds; nay, were it not absolute and perfect in every particular, it might wear the name of obedience, but its essence would disappear. Christian usage attaches such value to this perfection of obedience that it has been, and will ever be, accounted the distinguishing mark by which we are able to recognize Catholics. Admirably does the following passage from St. Thomas Aquinas set before us the right view: "The formal object of faith is primary truth, as it is shown forth in the holy Scriptures, and in the teaching of the Church, which proceeds from the fountainhead of truth. It follows, therefore, that he who does not adhere, as to an infallible divine rule, to the teaching of the Church, which proceeds from the primary truth manifested in the holy Scriptures, possesses not the habit of faith; but matters of faith he holds otherwise than true faith. Now, it is evident that he who clings to the doctrines of the Church as to an infallible rule yields his assent to everything the Church teaches; but otherwise, if with reference to what the Church teaches he holds what he likes but does not hold what he does not like, he adheres not to the teaching of the Church as to an infallible rule, but to his own will."[25]

23. "The faith of the whole Church should be one, according to the precept (1 Cor. 1:10): "Let all speak the same thing, and let there be no schisms among you"; and this cannot be observed save on condition that questions which arise touching faith should be determined by him who presides over the whole Church, whose sentence must consequently be accepted without wavering. And hence to the sole authority of the supreme Pontiff does it pertain to publish a new revision of the symbol, as also to decree all other matters that concern the universal Church."[26]

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Now that you've read it, go back and read the first bolded sentence, and replace "reason" with "the bible" . . .

At least the rationalist is honest in claiming human reason alone. The sola-scripturist is using the same tool, but not admitting it. The proof is the resulting dis-unity of doctrine.