(25) Inasmuch as the intellect is the best part of our being, it is evident that we should make every effort to perfect it as far as possible if we desire to search for what is really profitable to us. (26) For in intellectual perfection the highest good should consist. (27) Now, since all our knowledge, and the certainty which removes every doubt, depend solely on the knowledge of God;- firstly, because without God nothing can exist or be conceived; secondly, because so long as we have no clear and distinct idea of God we may remain in universal doubt - it follows that our highest good and perfection also depend solely on the knowledge of God. (28) Further, since without God nothing can exist or be conceived, it is evident that all natural phenomena involve and express the conception of God as far as their essence and perfection extend, so that we have greater and more perfect knowledge of God in proportion to our knowledge of natural phenomena: conversely (since the knowledge of an effect through its cause is the same thing as the knowledge of a particular property of a cause) the greater our knowledge of natural phenomena, the more perfect is our knowledge of the essence of God (which is the cause of all things). (29) So, then, our highest good not only depends on the knowledge of God, but wholly consists therein; and it further follows that man is perfect or the reverse in proportion to the nature and perfection of the object of his special desire; hence the most perfect and the chief sharer in the highest blessedness is he who prizes above all else, and takes especial delight in, the intellectual knowledge of God, the most perfect Being. (30) Hither, then, our highest good and our highest blessedness aim - namely, to the knowledge and love of God; therefore the means demanded by this aim of all human actions, that is, by God in so far as the idea of him is in us, may be called the commands of God, because they proceed, as it were, from God Himself, inasmuch as He exists in our minds, and the plan of life which has regard to this aim may be fitly called the law of God. (31) The nature of the means, and the plan of life which this aim demands, how the foundations of the best states follow its lines, and how men's life is conducted, are questions pertaining to general ethics. (32) Here I only proceed to treat of the Divine law in a particular application.