If a person studies too much and exhausts his reflective powers, he will be confused, and will not be able to apprehend even that which had been within the power of his apprehension. For the powers of the body are all alike in this respect.
Be convinced that, if man were able to reach the end without preparatory studies, such studies would not be preparatory but tiresome and utterly superfluous.
How individuals of the same species surpass each other in these sensations and in other bodily faculties is universally known, but there is a limit to them, and their power cannot extend to every distance or to every degree.
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.