Do not consider it proof just because it is written in books, for a liar who will deceive with his tongue will not hesitate to do the same with his pen.
He, however, who begins with Metaphysics, will not only become confused in matters of religion, but will fall into complete infidelity.
You must accept the truth from whatever source it comes.
To the totality of purposes of the perfect Law there belong the abandonment, depreciation, and restraint of desires in so far as possible.
Consequently he who wishes to attain to human perfection, must therefore first study Logic, next the various branches of Mathematics in their proper order, then Physics, and lastly Metaphysics.
You will certainly not doubt the necessity of studying astronomy and physics, if you are desirous of comprehending the relation between the world and Providence as it is in reality, and not according to imagination.
It is necessary to bear in mind that Scripture only teaches the chief points of those true principles which lead to the true perfection of man, and only demands in general terms faith in them.
If men possessed wisdom, which stands in the same relation to the form of man as the sight to the eye, they would not cause any injury to themselves or to others; for the knowledge of truth removes hatred and quarrels, and prevents mutual injuries.
However great the exertion of our mind may be to comprehend the Divine Being or any of the ideals, we find a screen and partition between Him and ourselves. Thus the prophets frequently hint at the existence of a partition between God and us.
You must consider, when reading this treatise, that mental perception, because connected with matter, is subject to conditions similar to those to which physical perception is subject.