1. One proof is this. No one strives with any earnestness of desire after anything, unless it be known to him beforehand. Since, then, as will be traced out in the following pages (B.III, Chap.CXLVIII), Divine Providence directs men to a higher good than human frailty can experience in the present life, the mental faculties ought to be evoked and led onward to something higher than our reason can attain at present, learning thereby to desire something and earnestly to tend to something that transcends the entire state of the present life. And such is the special function of the Christian religion, which stands alone in its promise of spiritual and eternal goods, whereas the Old Law, carrying temporal promises, proposed few tenets that transcended the enquiry of human reason.*
2. Also another advantage is thence derived, to wit, the repression of presumption, which is the mother of error. For there are some so presumptuous of their own genius as to think that they can measure with their understanding the whole nature of the Godhead, thinking all that to be true which seems true to them, and that to be false which does not seem true to them. In order then that the human mind might be delivered from this presumption, and attain to a modest style of enquiry after truth, it was necessary for certain things to be proposed to man from God that altogether exceeded his understanding.
3. There is also another evident advantage in this, that any knowledge, however imperfect, of the noblest objects confers a very high perfection on the soul. And therefore, though human reason cannot fully grasp truths above reason, nevertheless it is much perfected by holding such truths after some fashion at least by faith. And therefore it is said: Many things beyond the understanding of man are shown to thee (Ecclus iii, 23). And, The things that are of God, none knoweth but the Spirit of God: but to us God hath revealed them through his Spirit (I Cor. ii, 10, 11).
1.4 : That it is an Advantage for the Truths of God, known by Natural Reason, to be proposed to men to be believed on Faith
1.6 : That there is no Lightmindedness in assenting to Truths of Faith, although they are above Reason